Grey Swaddle Sleep Sack

No zippers. No Velcro. No snaps. No wrapping. Just slide it on — and sleep.

The Grey Swaddelini is the world's first seamless, closure-free swaddle. Instead of wrapping, tucking, or fumbling with hardware at 3am, it works like a sock — slip it over your baby and the 3D-knit fabric does the rest. The patented Hug Technology® gently mimics the pressure of being held, calming the Moro startle reflex that wakes newborns during active sleep and encouraging deeper, longer rest.

• World's first seamless 3D-knit swaddle — no zippers, no Velcro, no snaps, no wrapping technique to learn
• Patented Hug Technology® — gentle, even pressure around the chest mimics a parent's embrace and calms the Moro startle reflex
• Snug at chest, loose at hips — designed in compliance with AAP safe sleep guidelines; hip-healthy construction supports healthy joint development
• Transitions to a wearable blanket — when baby starts rolling, leave arms out for full freedom of movement while keeping the cozy, calming feel
• Made in Holland, Michigan, USA — sustainably sourced yarn, rigorously third-party safety tested
• Award-winning design — recognized by pediatric sleep specialists and parents alike

Sizing: Small fits 6–12 lbs · Large fits 12–18 lbs

Machine wash cold, tumble dry low. For babies 0–18 lbs.