Best Outdoor Thermal Bottoms for Men of 2025

The Talus Thermal Trousers from Mountain Warehouse are designed to keep you comfortable during outdoor activities. With Isotherm technology, these trousers retain heat without added bulk or discomfort, ensuring you stay warm. They also feature moisture-wicking properties that draw sweat away from your skin, helping you feel dry and fresh. The quick-drying fabric is perfect for travel, as it dries rapidly after washing or exposure to water. Additionally, these lightweight trousers are easy to wear and pack, making them ideal for camping, hiking, or any adventure.

The SIMIYA Thermal Bottoms are designed to offer exceptional warmth and comfort during cold weather. With a thermal fleece inner layer, they effectively trap body heat, ensuring your legs stay cosy in chilly conditions. The four-way stretch fabric enhances flexibility, making them perfect for both daily wear and outdoor sports. Additionally, the fly hole design adds convenience, allowing you to use the restroom with ease. Constructed with a non-inductive stitching process, these bottoms maintain their softness even after repeated washing, providing lasting comfort.

SIMIYA Thermal Long Johns are designed to keep you warm and comfortable during cold weather. The soft fleece lining and skin-friendly fabric trap body heat, ensuring your legs stay cosy without feeling bulky. If you're heading outdoors for a workout, the sweat-wicking technology helps keep moisture away from your skin, so you can stay dry and warm. The super elastic material allows for flexible movement, making them ideal for various activities, whether you're lounging at home or out in the winter chill.

The HYCOPROT Thermal Leggings are designed to keep you warm during winter activities. With a windproof exterior and soft fleece lining, they provide excellent insulation, making them perfect for outdoor adventures. The 4-way stretch fabric ensures a snug fit, allowing you to move freely whether you're at the gym or home. Additionally, the leggings offer muscle support and prevent strain, so you can remain active without discomfort. Lastly, their moisture-wicking properties keep sweat away from your skin, ensuring you stay dry and comfortable throughout your day.

The INNERSY Thermal Long Johns are designed to keep you warm and comfortable during winter activities. With a lightweight fabric that offers a snug fit, you can wear them all day without feeling bulky. The practical open fly makes these thermal leggings easy to use while providing warmth in chilly conditions. They are perfect for both outdoor adventures like skiing and cycling, as well as indoor lounging or work. Enjoy the high elasticity that ensures freedom of movement, keeping you flexible and cosy throughout the winter.

The SIHOHAN Thermal Long Johns are designed for ultimate comfort and warmth during cold weather. The cut-to-fit bottom allows you to adjust the length for a perfect fit, ensuring no loose threads or discomfort. With double thickness knee fabrics, you can enjoy extra protection against the chill while engaging in outdoor activities like hiking or skiing. The fleece lining locks in heat, preventing cold air from penetrating, making these leggings an ideal choice for winter outings. Plus, the tagless design enhances comfort, eliminating irritation from tags.

The DOLCE ENVY Thermal Bottoms are designed to keep you warm and comfortable during winter activities. Made from a blend of 50% cotton and 50% polyester, they offer excellent heat preservation while remaining lightweight. The breathable materials help regulate your temperature, ensuring you stay dry and free from unpleasant odours. These versatile long johns are perfect for both outdoor adventures and casual wear, making them a great addition to your winter wardrobe.

The MEETWEE Thermal Long Johns are designed to keep you warm during the winter months. Their windproof fabric and soft fleece lining provide exceptional warmth, allowing you to stay comfortable without the bulk of heavy clothing. With stretchable material, these thermal leggings offer freedom of movement, helping to prevent muscle strain during activities. Additionally, the moisture-wicking properties ensure you remain dry, absorbing sweat and avoiding unpleasant odours, making them perfect for both indoor and outdoor sports.

The B.U.L Thermal Long Johns are designed to keep you warm during winter activities such as outdoor work, travel, and skiing. Made from high-quality materials with a double brushed inside, they provide exceptional warmth and comfort, ensuring you stay active even in freezing temperatures. Their ultra-soft and lightweight fabric offers a smooth touch against your skin, while the stretchiness allows for easy movement. With a TOG rating of 0.45, you can trust these thermals to provide warmth without bulk, making them an excellent choice for layering.

The LAPASA Thermal Long Johns are designed to keep you warm during winter activities. They feature different weight options to suit various temperatures, ensuring you stay comfortable whether outdoors skiing or indoors relaxing. The snug fit prevents bunching, helping to retain heat effectively under your outer layers. Additionally, the four-way stretch fabric offers flexibility, allowing you to move freely while staying warm. The convenient open fly design ensures easy access when needed, making these long johns practical for everyday wear.