Featuring the LaCrosse Quad Core platform, the new LaCrosse 16" 4X Alpha 7.0mm WP combines four layers of cushioning comfort underfoot with the unbeatable waterproof protection of Alpha construction. The Quad Core platform combines lightweight outsoles, supportive midsoles, pressure point cushioning, stabilizing shanks, shock absorbing layers and cushioning footbeds into one unit to provide the best in comfort, stability and durability. LaCrosse Alpha Construction delivers uncompromising waterproof protection while allowing a snug fit on feet with the flexibility needed to easily slip the boot on and off. Built on a unique boot last, the narrowed ankle design of the Ankle Fit technology keeps boots from pulling loose by gripping the top of the foot and locking the heel in place. Soft toe. Natural hand-laid rubber in the upper resists water, bases, acids, alcohols, diluted-water solutions, cuts and punctures. Insulating neoprene provides comfortable and flexible warmth. 7.0 mm of naturally insulating neoprene rated for temperatures as low as -50° F.