DESCRIPTION

　　With 25 years of Merrell's women's-specific fit, the Siren 4 Thermo is uniquely engineered to cradle the distinct contours of female feet, providing comfort, support, and stability even on the longest hikes with 200 grams of added insulation for warmth and protection. Now equipped with SOLARCORE® insulation, lightweight insulation material initially designed for NASA, you never have to worry about warmth.

　　The all-new medial zipper provides easy on/off, a new improvement made directly from customer feedback. Merrell waterproofing on the upper will keep your feet dry. With Vibram® IceTrek® underfoot, traction remains consistent under the wettest, most slippery conditions. For the first time ever incorporating Vibram® traction lug for enhanced grip on uneven terrain.

PRODUCT DETAILS

　　Waterproof membrane seals out water and lets moisture escapeWaterproof full grain leather and knit upper100% recycled laces and webbingHeavy-duty, Waterproof, YKK medial zipper for easy on and offBellows tongue keeps out debrisProtective and abrasion resistant rubber heel and toe capSOLARCORE® Aerogel insole provides underfoot superior warmth while being extremely flexible and ultra-thin100% recycled mesh footbed coverCleansport NXT™ treated for natural odor control5% recycled removable PU footbedFloatPro™ Foam midsole for lightweight comfort that lastsVibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfacesVibram® traction lugs specifically designed to increase traction and shed debris with each step

SPECS

　　Weight - 1lb 3.04oz / 540g per half pair

　　Drop - 8mm

　　Lug - 5mm

　　Stack Height - 28.5 - 20.5mm

　　Insulation - 200 grams Primaloft® Gold Eco Series synthetic insulation

　　Lining - 100% recycled fleece lining