Sea Anemone Ear Flap Hat: Free Knitting Pattern
There is something deeply satisfying about a knitting project that looks far more complicated than it actually is. The Sea Anemone Ear Flap Hat is exactly that kind of project — a showstopper that draws comments and compliments wherever you wear it, yet relies on techniques that any intermediate knitter can master with a little patience and the right guidance. With its textured, tentacle-like bobbles spilling over the crown and ear flaps, this hat captures the otherworldly beauty of a sea anemone in yarn form, turning a cold-weather essential into a wearable piece of art.
Whether you are knitting for yourself, for a child who loves ocean creatures, or for the person in your life who already has every plain beanie imaginable, this pattern delivers something genuinely different. Best of all, it is completely free. Read through the full pattern below, including the materials list, stitch glossary, sizing notes, and step-by-step instructions, and you will have everything you need to cast on today.
Why You Will Love This Pattern
Before diving into the instructions, it is worth talking about what makes this hat special and why so many knitters come back to it again and again.
The defining feature of the Sea Anemone Hat is its bobble texture. Bobbles are small, three-dimensional clusters of stitches that pop off the fabric surface, creating that signature bumpy, tentacle-covered appearance. When worked in a tonal or variegated yarn in ocean-inspired colors — think deep teal, coral, dusky purple, or sandy taupe — the effect is stunning. The bobbles catch the light differently than the surrounding stockinette fabric, giving the hat a layered, almost sculptural quality.
The ear flaps add both function and beauty. Rather than a simple folded brim, the ear flaps extend downward from the hat body, curving gently to protect the ears on blustery winter days. Bobbles continue onto the ear flaps, so the sea anemone theme is consistent from crown to chin. A simple twisted cord or i-cord tie keeps everything in place without adding bulk.
This is also a relatively quick knit by hat standards. If you work on it steadily over a few evenings, most knitters finish within a week. That makes it an excellent project for gift-giving seasons when you want something impressive but do not have months to spare.
Materials and Tools
Getting your materials together before you start will make the knitting process smooth and uninterrupted.
Yarn: You will need approximately 150 to 200 yards of worsted weight yarn (also labeled as Category 4 or medium weight) for the adult size. A single skein of most standard worsted yarns is sufficient. For the child size, 100 to 150 yards is plenty. Choose a yarn with good stitch definition so your bobbles stand out clearly. Wool and wool-blend yarns work beautifully for this because they have natural elasticity and excellent memory, which helps the bobbles hold their shape after blocking. Superwash wool is a practical choice if you want easy machine-wash care. Some excellent options include Cascade 220, Lion Brand Wool-Ease, Paintbox Simply DK (held double), or Malabrigo Rios. For a more budget-friendly option, Red Heart Soft or Caron Simply Soft both give lovely results.
Needles: US size 8 (5.0 mm) circular needles, 16-inch cable length, for the hat body. You will also need a set of US size 8 double-pointed needles for the crown decreases when the stitch count becomes too small to work comfortably on the circular. If you prefer magic loop knitting, a 32-inch or longer circular needle can substitute for the double-pointed needles.
Additional tools: Stitch markers (at least 4), a tapestry needle for weaving in ends, scissors, a measuring tape, and a crochet hook in a similar size if you prefer to pick up stitches that way.
Gauge: 18 stitches and 24 rows over 4 inches in stockinette stitch. Getting gauge is important for a hat because even a small discrepancy in stitch count can mean the difference between a hat that fits snugly and one that falls over your eyes. Work a swatch, wash it gently the way you plan to wash the finished hat, let it dry flat, and then measure. Adjust needle size up or down as needed.
Sizes
This pattern is written for three sizes: Child (ages 3 to 8), Adult Small/Medium, and Adult Large/XL. The numbers in the pattern will appear in that order throughout, with alternate sizes in parentheses.
Finished circumference (after slight negative ease): 17 (20, 22) inches
Finished height from cast-on edge to crown: 7.5 (9, 10) inches
Most adult heads measure between 21 and 23 inches in circumference. Hats are typically knitted with one to two inches of negative ease so they fit snugly enough to stay in place, which is why the finished measurements above are slightly smaller than typical head circumferences.
Abbreviations and Stitch Guide
k — knit
p — purl
k2tog — knit two stitches together (a right-leaning decrease)
ssk — slip, slip, knit (a left-leaning decrease)
pm — place marker
sm — slip marker
CO — cast on
BO — bind off
RS — right side
WS — wrong side
MB (make bobble) — This is the star of the whole pattern, so it deserves a detailed explanation.
To make a bobble: Into the next stitch, work (k1, p1, k1, p1, k1) — that is five stitches made from one. Turn your work so the wrong side is facing. Purl across those five stitches. Turn again so the right side faces you. Knit across the five stitches. Turn once more and purl across the five stitches. Now, using the tip of your left needle, pass the second, third, fourth, and fifth stitches over the first stitch and off the needle, one at a time, so only one stitch remains. You have completed the bobble. The bobble will initially look flat or uncertain, but once you give it a little pinch from the back and continue knitting a few more rows, it will bloom forward beautifully.
For knitters who prefer a simpler bobble, a three-row version works as follows: Into the next stitch, work (k1, p1, k1) to make three stitches from one. Turn and purl three. Turn and knit three. Pass the second and third stitches over the first. This gives a slightly smaller bobble that works especially well for the child size or for knitters who find the five-row version fiddly.
Pattern Instructions
Ear Flaps (Make Two)
The ear flaps are knitted flat before you join to work the hat in the round. Begin with the left ear flap.
Using your straight needles or working flat on your circular needle, CO 3 stitches.
Row 1 (WS): Purl across.
Row 2 (RS): K1, make 1 left (M1L), knit to last stitch, make 1 right (M1R), k1. (5 sts)
Row 3: Purl across.
Row 4: Repeat Row 2. (7 sts)
Row 5: Purl across.
Row 6: Repeat Row 2. (9 sts)
Row 7: Purl across.
Row 8: Repeat Row 2. (11 sts)
For the child size, stop here with 11 stitches. For Adult S/M, continue two more increase rows until you have 15 stitches. For Adult L/XL, continue until you have 17 stitches.
Now work even in stockinette (knit RS rows, purl WS rows) for 4 (5, 6) more rows, ending on a WS row. Place the stitches on a holder or spare length of yarn and set aside.
Make the second ear flap the same way.
Bobble Rows on Ear Flaps
Before joining, go back to each ear flap and work one bobble row for decoration.
With RS facing, work across the ear flap as follows: K3, MB, knit to last 4 stitches, MB, k3. For wider ear flaps in the larger sizes, you can place a third bobble in the center stitch. Work one more WS row in purl, then place back on the holder. These bobbles will form the bottom fringe of tentacles along each ear flap edge.
Joining and Hat Body Setup
Using your 16-inch circular needle, CO stitches for the front brim section and join everything together as follows.
CO 10 (12, 14) stitches for the front section. With RS facing, knit across the 11 (15, 17) stitches of the right ear flap. CO 10 (12, 14) stitches for the back section. Knit across the 11 (15, 17) stitches of the left ear flap. Join to work in the round, being careful not to twist. Place a marker for the beginning of the round.
Total stitches: 42 (54, 62). If your stitch count feels off, check that you have picked up all stitches cleanly from your ear flap holders.
Work 2 rounds in knit (this creates the lower rolled edge of the brim above the ear flaps).
Brim Ribbing
Work in k2, p2 ribbing for 6 (8, 8) rounds. This creates a neat, stretchy brim that hugs the forehead and transitions smoothly into the textured body of the hat.
Bobble Band
After the ribbing, it is time to work the first full bobble round, which creates a vivid band of texture right above the brim.
Round 1 (bobble round): K2, MB, k1; repeat from around, adjusting the final repeat if needed to end cleanly at your marker.
Round 2: Knit all stitches.
Round 3: K1, MB, k3; repeat from , ending k2.
Round 4: Knit all stitches.
This offset placement of bobbles between rounds one and three creates the staggered, organic look that resembles actual anemone tentacles rather than a uniform polka-dot pattern. The randomness is part of the charm.
Hat Body
Work the following sequence to build the main body of the hat, continuing the anemone texture throughout.
Rounds 1 through 3: Knit all stitches.
Round 4: K3, MB; repeat from around.
Rounds 5 through 7: Knit.
Round 8: K1, MB, k3; repeat from , end k2.
Rounds 9 through 11: Knit.
Round 12: K3, MB; repeat from around.
Repeat these 12 rounds until the hat measures 5.5 (7, 8) inches from the cast-on edge of the brim, or your desired length before beginning crown decreases.
For knitters who want a denser bobble texture, you can reduce the plain knit rounds between bobble rows from 3 rounds to 2. This uses a bit more yarn but produces a gloriously thick, tentacle-covered surface that is especially dramatic in the larger adult size.
Crown Decreases
Switch to double-pointed needles or magic loop when the stitches become too tight on the circular.
Setup round: Knit one full round, distributing stitches evenly across 4 double-pointed needles if using them. Place a marker every 10 (13, 15) stitches so you have 4 (4, 4) evenly spaced sections.
Decrease Round 1: Knit to 2 stitches before marker, k2tog, sm; repeat from around. (4 stitches decreased)
Round 2: Knit.
Repeat these two rounds until 20 stitches remain. Then work the decrease round every round (without the plain knit round between) until 8 stitches remain.
Cut the yarn, leaving a 6-inch tail. Thread the tail onto your tapestry needle and draw it through the remaining 8 stitches, pulling firmly to close the crown. Pass the needle through to the inside of the hat and weave in the end securely.
Finishing
Weave in all remaining ends, paying special attention to the join points where the ear flaps were picked up. These areas sometimes have small gaps; a careful duplicate stitch or two on the wrong side closes any holes neatly.
For the ear flap ties, cut 6 strands of yarn each approximately 18 inches long. Fold them in half and use a crochet hook to pull the looped end through the tip of one ear flap, then pass the loose ends through the loop and pull snug. Divide the strands into three groups of four and braid to desired length, then knot at the end. Repeat for the second ear flap. Alternatively, make two small twisted cords by cutting 4 strands of yarn each about 24 inches long, holding them together, anchoring one end, and twisting tightly until they want to fold back on themselves. Fold in half and let them twist around each other naturally, then knot the ends.
Block the finished hat by soaking it in cool water for 20 minutes, pressing out excess moisture without wringing, and then laying it flat or placing it on a hat block to dry. Blocking helps the bobbles open up fully and evens out any tension inconsistencies across the hat body. The finished hat will look significantly more polished after blocking, and the tentacle bobbles will be much more defined.
Color and Yarn Suggestions
Color choice makes an enormous difference to how the sea anemone theme reads on the finished hat. Single solid colors in deep oceanic tones are always striking — a rich peacock teal, a warm coral red, or an inky midnight blue all look magnificent with the bobble texture.
Gradient or tonal yarns add extra dimension because the color shift moves through the bobbles at a slightly different rate than the background stitches, creating subtle highlights across the tentacle surface. Hand-dyed tonal skeins from indie dyers in colorways with names like “Deep Reef,” “Tideline,” or “Bioluminescence” are perfect for this project.
If you are feeling adventurous, try knitting the brim and ear flaps in one color and switching to a contrasting color for the hat body. A sandy taupe brim with a vivid coral body, or a charcoal body with deep sea-green bobbles worked using a small amount of a second color, both create visually layered results that look professional and intentional.
Tips for Success
Bobbles can feel awkward at first, especially the turning back and forth on a small number of stitches while the rest of your work hangs waiting. The best advice is to slow down and not rush the turning. Use the tips of your needles deliberately, keep your tension even during the bobble rows, and do not pull the yarn too tightly when you pass stitches over to close the bobble.
If your bobbles are appearing on the wrong side of the fabric, you are likely turning after the wrong row. Remember that the bobble should always pop outward on the right side of the hat. When you work in the round, every row is a right side row, so the bobbles should naturally face outward. If you are practicing on a flat swatch, make sure your bobble rows always fall on a right side (knit) row.
Keeping track of your bobble round placement is easier if you use a row counter or simply make a small tally in a notebook. After the first repeat you will find the pattern becomes intuitive and the counting feels natural.
A Note on Gifting This Hat
This hat has become a beloved gift item for many knitters because it looks so much more elaborate than it is. Recipients are invariably delighted and often assume it took far longer to make than it did. If you are making it as a gift, consider packaging it inside a small box with some ocean-colored tissue paper, or pair it with a small piece of local sea glass or a beautiful shell from a beach walk. The sea anemone theme lends itself to this kind of thoughtful presentation.
For children especially, this hat sparks imagination. Many kids who wear it want to know all about sea anemones — how they live, how they move, what creatures shelter among their tentacles. It becomes a small wearable education about the ocean, and that is a lovely extra gift to give alongside the knitting itself.
