25 years of Merrell's women's-specific fit. The Siren 4 is uniquely engineered to cradle the distinct contours of female feet, providing comfort, support, and stability even on the longest 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 1 lbs-9oz/700g