When the temperature drops, blood vessels in our extremities constrict to redirect blood flow to vital organs like the brain and heart — that leaves hands and feet vulnerable to heat loss. Working out in the cold becomes uncomfortable, difficult, and less productive — that is, unless you slide heating pads into your gloves. Heat Treat Hand Warmers keep a temperature of 135-156 degrees F for up to seven hours. (You can wrap ’em in cloth if they feel too warm, so you don’t end up like the villain in the opening scenes of Raiders of the Lost Ark.)
The warmers’ active ingredients — iron, water, cellulose, vermiculite, activated carbon, and salt — create an exothermic oxidation reaction when exposed to air. Therefore the packs last longer when kept in enclosed spaces such as gloves or pockets. Grabber Performance also makes a Heat Treat Mega Hand Warmer that lasts up to 12 hours, toe warmers for boots, and body adhesives — all safe and nontoxic. Pricing starts at about $1 a pair.