For a quarter-century, Merrell has perfected its women's-specific fit. The Siren 4 is meticulously crafted to embrace the unique curves of female feet, offering unparalleled comfort, support, and stability throughout extensive hikes. FEATURES GORE-TEX® waterproof membrane, exceptional breathability and waterproof performance Breathable mesh and TPU upper Metal Hook and 100% recycled laces and webbing Bellows tongue keeps out debris Protective and abrasion resistant rubber toe cap 100% recycled breathable mesh lining 100% recycled mesh footbed cover Cleansport NXT™ treated for natural odor control Removable PU footbed Rock plate for protection FloatPro™ Foam midsole for lightweight comfort that lasts Vibram® TC5+ outsole provides exceptional traction for outdoor multi-sport activities, formulated exclusively for Merrell Stack Height: 28.5-20.5mm Drop: 8mm Lug: 5mm GORE-TEX waterproof membrane. Exceptional breathability and waterproof performance combined with a breathable mesh and TPU upper 100% recycled laces, webbing, breathable mesh lining and footbed cover Bellows tongue keeps out debris while the abrasion resistant rubber toe cap provides added protection FloatPro Foam midsole for lightweight comfort that lasts and a rock plate for added protection Vibram TC5+ outsole technology gives you confidence with every step from mountain trails to city streets. Made exclusively for Merrell, Vibram TC5+ delivers all-around grip, traction, and durability designed for every day wear