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The Den Sleep Sack in cream with ice blue trim, front view: honeycomb knit, two-way zipper, crescent moon embroidery
Den Sleep Sack front view on white Den Sleep Sack three-quarter view showing A-line shape Macro of the honeycomb knit, blue trim and zipper Den Sleep Sack folded with moon embroidery visible Den Sleep Sack storybook illustration

The Den Sleep Sack

★★★★★  4.9  |  84 reviews
$34
✓ In stock soon  •  Free shipping  •  30-night sleep guarantee

A wearable snow den your baby can never kick off: sleeveless snösoft™ air-cell knit that holds gentle warmth when they run cool and releases excess heat when they run warm. The safe-sleep replacement for every loose blanket, with a two-way zipper for 2am changes.

Warmth (TOG)
0.5 TOG · Summer
1.0 TOG · All Season
Size
0-6M
6-18M
Bundle & Save
1 Sleep Sack$42
2 Sleep SacksSave 10%$76
3 Sleep Sacks (Full Den)Save 15%$107
❄ OEKO-TEX® Standard 100 ❄ Snug-fit, U.S. sleepwear standards ❄ 30-night guarantee
snösoft™ is a fine honeycomb knit of breathable plant-based lyocell and soft cotton. The hexagonal micro air cells are knitted into the structure itself, never sprayed on, so the temperature-regulating effect survives wash after wash. No bamboo viscose, no polyester fleece.
Sleeveless by design: bare arms are the safe-sleep standard for wearable blankets and part of how the sack regulates temperature. 0.5 TOG suits warm rooms and summer; 1.0 TOG is the year-round choice for most nurseries. Wear over a snösoft™ footie in winter or over a diaper and short sleeves in summer. The two-way zipper opens from the bottom for night changes without waking arms.
Machine wash cold on gentle with like colors, tumble dry low. Skip fabric softener; it coats the air cells. The honeycomb texture is knitted in and holds its shape and softness for the long haul.
Free shipping on every order. Then put your baby in snösoft™ for 30 nights. If your mornings don't change, send it back for a full refund. No questions, no forms, no fine print.

The blanket that can never be kicked off

Loose blankets don't belong in cribs. The Den Sleep Sack does the blanket's job, safely, all night.

Holds warmth gently

When your baby runs cool, each air cell keeps a thin layer of warmth close to the body. No blanket to kick off means no 4am cold wake-up.

Releases excess heat

When your baby runs warm, the open structure vents heat and moisture instead of pooling it against their skin. Dry backs, no damp hair.

Safe from the first night

OEKO-TEX® Standard 100 certified fabric in a snug-fit cut made to U.S. children's sleepwear standards, sized newborn to toddler.

From dens across the country

Early parents from our test batch, in their own words.

Baby sleeping in a bare crib wearing the Den Sleep Sack
★★★★★

"We retired the swaddle at 4 months and I was dreading the transition. She did her first full night in the Den Sack that week. No blanket anxiety, no cold hands at the night feed, just a sleeping baby."

Jasmine T.  ✓ Verified
Happy baby standing in a bare crib wearing the Den Sleep Sack
★★★★★

"Our old fleece sack left him damp every single morning. With the waffle one his hair is dry and he wakes up happy instead of crying. He stands up grinning in it like it's his little uniform."

Erin M.  ✓ Verified
Drowsy baby held on a parent's shoulder wearing the Den Sleep Sack
★★★★★

"Bought the 0.5 for summer and came back for the 1.0. The bottom-opening zipper means diaper changes without fully waking her, and the little moon gets us compliments from every grandparent on video call."

Carla B.  ✓ Verified