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.Merrell Womens Siren 4 GTX Features: GORE-TEX waterproof membrane, exceptional breathability and waterproof performance Breathable mesh and TPU upper 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 Vibram traction lugs specifically designed to increase traction and shed debris with each step Stack Height: 28.5-20.5mm Drop: 8mm Lug: 5mm Vegan-Friendly Half pair weight: 0lbs-11.46oz, 325g