Classically known as ‘long johns’, men’s thermal trousers are at the top of any outdoor expedition packing list. Essential for winter walks and rainy hikes, and ideal for layering under waterproof trousers for optimum warmth, men’s thermal bottoms are an important purchase. Tiso’s range of thermal pants and trousers features full length and 3/4 leg thermal leggings for men at a variety of prices, all from top brands.