Guls' latest boot evolution. The Viper Boot features our exclusive Boltdry, quick dry thermal lining as well as some additional brand new features. The 5mm Viper Split Toe Boot is super flexible and lightweight whilst being incredibly warm. Featuring Boltdry Guls' Quick dry core that wicks water away from the skin creating a cushion of air between the foot and the boot creating ultimate insulation and warmth. The viper boot uses a Neonseam liquid seam to give a 100% watertight seal on the seams. RS-Flex neoprene gives this boot great durability.