Check the listing for details. Toasti Toes Self-Activating Foot Warmer (One Pair). Condition: New. Listed at 6.88 USD. To warm cold feet, the Foot Warm-Up fits comfortably in shoes or boots for up to 6 hours of 110?F of warmth. 2 1/4" x 4". Two per package. Toasti Toes with adhesive stick under your toes and give up to 5 hrs of warmth. Price For: Each Activates By: Contact with Air Package Configuration: Pair Width: 2-3/4" Heating Time: Up to 8 hr. Length: 3-1/2" Item: Toe Warmer Country of Origin (subject to change): United States