Women's Siren 4 Thermo Mid Zip Waterproof I4681M1001 down-like insulation with breathable and

down-like insulation with breathable and warming properties

moisture-wicking 100% polyester mesh liner with PU foam base that helps reduce friction against skin

This style has a pull tab to ease entry and a padded tongue for ultimate comfort

Roomy toe box for natural movement - With Altra’s signature FootShape fit

Fit: Runs small

Women's Siren 4 Thermo Mid Zip Waterproof I4681M1001 down-like insulation with breathable andThe 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,