HALO SleepSack Base Layer 100% Polyester The perfect partner to any Halo Sleep sack, the Halo Base layer gown from ComfortLuxe performance fabric provides easy diaper access while keeping baby's skin comfortable and dry Lap shoulder design for easy dressing; rollover cuffs on sleeves prevent scratching The only garments to be awarded the seal of acceptance by the National Eczema Association, ComfortLuxe fabric helps to promote healthy skin by regulating body temperature and wicking moisture away where it evaporates quickly (twice as fast as cotton) Wearing this breathable base layer under a Sleep sack swaddle wearable blanket will keep your baby warmer when it's cool and cooler when it's warm, for a healthier, safer and more comfortable sleep Fits babies 6-12 pounds