Weighted Sleep Sack Grey Star Giftalot Organic Baby Sleep Sack Sleeveless Muslin White Sleep Sack Under Dune Stripe Mini Three Season Side Zip Mid Weight Sleep Sack Merino & Me Light Blue Fleece Sleeping Sack Infant Hudson baby, Fleece sleeping. HALO SleepSack is the original wearable blanket for safe sleep, designed to help babies get better, longer sleep. As the next step after swaddles, it ensures a smooth transition with its zipper for easy diaper changes and a roomy, extra long sack that supports hip health and extends use. Crafted from breathable 100% cotton fabric, it offers cozy quality comfort your baby will love.