Extremely comfortable socks made with 85% polyester and 15% Lycra®. ZEPTO® fiber heat technology covers the entire foot area, providing uniform heat on the top and bottom of toes. Custom-fit design for left and right feet, designed to fit under tall or short boots. Note: GEN-X3 and GEN-X4 are fully compatible.

• Made with 85% polyester and 15% lycra
• Made of technical anti-micro bacterial lycra® from DuPont
• Extra tall to cover most of your calf
• Provides heat on the top and bottom of the toes
• The ZEPTO® fiber heat technology covers entire foot area providing uniform heat
• Custom fit design for left and right feet
• Fits under tall or short boots
• Each sock uses 12 volts
• Socks (as a pair) draws 1.4 amps of current to produce 19 watts of heat