Built for the discerning, technical fly-fisher-person who invests in only the very best, the Simms Men's G4 Boa Boot provides sheer performance, comfort, support, and amazing traction while you wade. Its waterproof PU-coated leather and TPU-coated textile uppers supply maximum abrasion-resistance, durability, and protection while the G4's fully lined neoprene fabric adds wading comfort, cushioning, and easy-on and easy-off. A Boa closure system ensures a precision, on-demand fit, a smooth, even closure with no pressure points, and one-handed adjustment. Designed with Simms RiverTread platforms, the G4 delivers maximum comfort, performance, and slip-resistance so you can concentrate on making that perfect cast. In addition, the RiverTread is both trail-ready and wading-ready, thanks to its molded 3D footbed with arch support and ball flex that align your foot for all-day comfort and optimal bio-mechanics. The molded dual-density EVA midsole provides cushioning for hiking comfort and enhanced proprioception. Simms also equipped the RiverTread platforms with molded, minimal, and hidden TPU retention plates for cleat retention and enhanced proprioception. And for long-lasting traction on trails, slip-resistance in water, and toe protection, you can rely on the Boa boot's molded Vibram Idogrib rubber outsole with 4 millimeters of self-sharpening, multi-directional lugs.