HOTHF-1 Features: -The foot warm - up.-The 2.25" x 4" foot warm - up is designed to operate on less oxygen than our other body warmers.-Perfect for the inside of shoes or boots.-Comforting 130 degrees heat for up to 6 hours.-Made in the U.S.A..-Hot Foot Feet Warmers (Pair).-New out of box defects replace only.