W's Siren 4 Thermo Mid Zip Waterproof polar stuff sack – but packs

stuff sack – but packs small for compact travel

DuraFresh natural bio-technology activates to fight odors

Broad Spectrum filters out harsh UVA and UVB raysUPF 50Recommended by The Skin Cancer FoundationPFC-free

bold colours and the perfect amount of flash to make you shine

Elasticated Cuffs

W's Siren 4 Thermo Mid Zip Waterproof polar stuff sack – but packsWith 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,