Versatile 2 in 1 Design converts from a sleep sack to a sleep suit with legs using 4 way zippers perfect for toddlers transitioning from a crib to a bed and active sleepers. TOG rated for Temperature Regulation available in multiple TOG ratings 0.3 1.0 2.5 and 3.5 to suit various room temperatures without extra blankets. Reduces the risk of crib climbing injury Sleep Suit mode provides comfort by not restricting the legs during sleep. Available in Four Sizes fits infants to young children from 3 12 months up to 4 6 years. Designed to be worn over pajamas for added comfort. Layering Guide Included comes with a room thermometer and What to Wear guide to help parents dress their child appropriately pairs with TOG rated layers pajamas or arm warmers sold separately.