Seriously, the best sleep sack around! My husband and I both love Kaiya sleep sacks so much, we use them with both our baby girls (twins) and they both love them! They are the softest that I have ever felt (and we've tried a lot out because getting both babies to sleep is a MUST), the best at being warm and still breatheable, the have cuffs for the hands, a night time bottom zipper, and a built in TEMPERATURE sensor sticker near the babies chest. FIVE STARS and round of applause from this two time twin mama!!