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We stock a range of base layers and undergarments ranging from cotton base layer long sleeve t-shirts and winter leggings ideal for cold weather, skiing, mountain climbing and hiking to tight fit underwear perfect for use on duty, in the gym or on the pitch. With brands including the popular Under Armour base layer range and 5.11 base layers, you will be sure to keep warm or cool all year round. Get free UK delivery with your Under Armour and 5.11 as standard when ordering online with MedTree.