Merrell Siren 4 Thermo Mid Zip Waterproof Women's Walking Boots A winter-ready boot with a Women's-specific fit that combines function and all-day wear-ability. Waterproof Full Grain Leather Upper Utilising a full grain leather construction, the Siren 4 Thermo Walking Boots have a comfortable, durable upper with the ability to keep feet cool, as well as dry thanks to the waterproof membrane. The leather materials provide an enhanced level of protection against, knocks and bumps, dirt and debris, for boots with long-lasting properties. A Merrell waterproof membrane features to further ensure that water, rain and damp conditions are kept on the outside, therefore keeping feet dry and cosy no matter what the conditions are. A bellows tongue helps to keep out debris while a protective and abrasion-resistant rubber heel and toe cap helps to protect you against rocks and uneven surfaces. The recycled bungee laces and toggle closure keeps feet locked in and secure, ensuring in