Best Breathable Thermal Bottoms for Men of 2026

The Talus Thermal Baselayer Trousers from Mountain Warehouse are designed for outdoor enthusiasts like you. With Isotherm technology, these trousers retain heat while remaining light and comfortable. The moisture-wicking feature actively pulls sweat away from your body, keeping you dry during hikes or camping trips. Additionally, the quick-drying fabric ensures that even if you get wet, the trousers will dry swiftly, making them ideal for travel. Lightweight and easy to pack, these trousers are perfect for any active adventure.

The HIPOWER Thermal Long Johns are designed to keep you warm during the chilly winter months. Made from ultra-soft micro-fleece fabric, they fit snugly to minimise heat loss while remaining lightweight. The advanced 4-way stretch allows for excellent comfort and movement, making them perfect for activities like running or yoga. Additionally, their moisture-wicking properties ensure you stay dry by quickly drawing sweat away from your skin, providing you with a sense of security in cold weather.

The Heatwave Thermal Trousers are an essential addition to your winter wardrobe. This pack of two offers a 0.45 TOG rating, ensuring you stay warm by trapping more air close to your skin. The comfort fit, with its ribbed construction, shapes perfectly to your body contours, providing both warmth and comfort. Available in multiple colours, these thermal trousers are ideal as a baselayer, making them versatile for various outdoor activities or lounging at home.

The Smartwool Merino 250 Bottoms are crafted from 100% merino wool, providing exceptional comfort and breathability. The interlock knit enhances thermoregulation, helping you stay warm without overheating. You will also appreciate the odour resistance, which keeps you feeling fresh during your activities. The updated fit not only improves functionality but also adds a touch of style, making these bottoms suitable for various occasions.

The Heat Stoke Thermal Long Johns are designed to keep you warm during the cold winter months. With a TOG rating of 0.45, these long johns effectively trap body heat, ensuring you stay comfortable. The brushed inside technology enhances cold resistance, providing extra warmth. Additionally, the ribbed construction fits your body perfectly, while the open fly design adds convenience. Made from a blend of 50% cotton and 50% polyester, these long johns are both soft and durable, making them an excellent choice for chilly days.