SIREN 4 THERMO CHELSEA WP SIZE:9 Low heel is perfect for

Low heel is perfect for all day comfort

Birkenstock's anatomical footbed cradles your foot

Soft insole can be removed to accommodate a custom orthotic

Elastic bungee lace offers you adjustability and support

400 gram 3M™ Thinsulate™ insulation

SIREN 4 THERMO CHELSEA WP SIZE:9 Low heel is perfect forSiren 4 Thermo Chelsea WP is a LADIES casual winter walking boot by Merrell Waterproof leather upper with waterproof, breathable membrane Removable footbed is treated with NXT to prevent odour 100 grams Primaloft Gold Eco Series synthetic insulation Solarcore insulation with Aerogel provides underfoot superior warmth while being extremely flexible and ultra thin Vibram Ice Trek outsole designed to provide improved grip on very cold, icy, or snowy