The foot warmer can be attached to the bottom of leg rest of the stroller and is used to protect baby while sleeping on the stroller. It is also a safety feature as our stroller can be adjusted to 180º. Most of stroller sold in USA recline less than 145° but our stroller can be adjusted up to 180°. As a sleep sack it is comfortable for baby while sleeping flat on the stroller or in a crib. It is made with 100% polyester for easy cleaning as well. There are three color choices: Navy / Lt Blue, Black / Red, Earth Tone/Beige.