FIRSTGEAR® THERMO 1-PIECE SUITS Firstgear® thermo 1-piece suits are made of 100% waterproof 210 Denier™ Hypertex™ and feature a 120-gram polyester insulation — perfect to use as cold-weather riding suit as well as rainsuits. These suits have full storm flap closures on zippers, pockets and cuffs for complete protection against the rains. They are backed by a 1-year limited manufacturer's warranty.