Milwaukee® M12™ Heated Ripstop Vest: Powered by M12™ REDLITHIUM™ Battery Technology, the Milwaukee® M12™ Heated Ripstop Vest integrates (3) carbon fiber heating elements between a durable Ripstop shell and thermal fleece liner to distribute and maintain heat across core body areas. The Ripstop Vest is insulated, wind and water resistant, and features premium Ripstop fabric, high-wear zone reinforcement, and heavy duty construction to protect from abuse on the jobsite.