The Women's Siren 4 Thermo Mid Zip Waterproof features:

• 200 grams Primaloft® Gold Eco Series synthetic insulation
• Solarcore® Aerogel insole provides underfoot superior warmth while being extremely flexible and ultra-thin
• Waterproof full grain leather upper, complete with a waterproof membrane seals out water and lets moisture escape
• Vibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces
• Heavy-duty, Waterproof, YKK zipper for easy on and off
• Protective and abrasion resistant rubber toe cap
• Cleansport NXT™ treated for natural odor control
• FloatPro™ Foam midsole for lightweight comfort that lasts
• Shaft height (top of midsole to top of boot): 5.91in, 150mm