Best Lightweight Thermal Bottoms for Men of 2025

The Talus Thermal Trousers from Mountain Warehouse are designed to keep you warm without the bulk. Their Isotherm technology features densely packed fibres that retain heat, making them perfect for chilly outdoor activities. Moisture wicking ensures that sweat is drawn away from your body, keeping you dry and comfortable. Additionally, these trousers dry quickly, allowing you to wash them easily or wear them during holiday adventures without worry. Lightweight and easy to pack, they are ideal for active use, making them a great choice for camping and hiking.

The LAPASA Thermal Long Johns are designed to provide exceptional warmth and comfort during the colder months. With various weight options, you can choose the perfect pair according to the temperature, ensuring you stay warm whether you’re skiing, running, or cycling. The snug fit prevents any bunching, allowing for better heat retention and a comfortable experience under your outer layers. Additionally, the four-way stretch fabric ensures flexibility, moving with your body and offering a full range of motion for any activity.

The Mountain Warehouse Thermal Trousers are designed to keep you warm and comfortable. Made from high-quality Merino wool, these trousers have natural antibacterial properties, ensuring you stay fresh during your outdoor activities. They actively wick moisture away from your body, helping you feel dry and comfortable even during intense exercise. Additionally, the quick-dry feature allows the fabric to dry rapidly, making them perfect for camping or hiking trips. With these trousers, you can enjoy your adventures without worrying about discomfort.

The DOLCE ENVY Thermal Bottoms are designed to keep you warm and comfortable during winter activities. Made from a blend of cotton and polyester, these long johns feature heat preservation technology, ensuring you stay lightweight while minimising heat loss. The breathable materials help regulate your temperature, making them perfect for various activities. Additionally, these thermal bottoms effectively absorb sweat, keeping you dry and free from unpleasant odours, allowing you to focus on your adventures.

The Sesto Senso Thermal Long Johns are designed for comfort and warmth. Made from lightweight, breathable cotton, they provide a snug fit without restricting movement, making them ideal for outdoor activities. The ankle-length design features flat seams for added comfort, ensuring you can wear them all day without irritation. The wide, elastic rubber waistband offers a secure fit, giving you confidence as you tackle your adventures.

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 LAPASA Merino Wool Long Johns provide the perfect combination of warmth and breathability. Made from 100% natural Australian merino wool, these thermal bottoms keep you comfortable in any season, ensuring you stay cool in the heat and warm in the cold. The extra soft fabric feels supple against your skin, eliminating any itchiness. With a durable 4-way stretch ribbed hem, you can enjoy flexibility and long-lasting wear, making them ideal for outdoor activities like hiking and skiing.

The Bassdash Thermal Base Layer Pants are designed to keep you warm and comfortable during outdoor activities. The double-sided brushed fabric provides warmth and a soft texture, while the technical thermal treatment helps keep you dry by absorbing moisture from your body. The odour-resistant treatment ensures you won’t have to worry about unpleasant smells, allowing you to focus on your adventure. With a soft elastic waistband and functional fly opening, these pants offer convenience and comfort, making them ideal for fishing, hiking, and hunting in cool to cold weather.

The Talus Thermal Trousers by Mountain Warehouse are designed for outdoor enthusiasts. Featuring Isotherm technology, these trousers trap warmth without the bulk, keeping you cosy during chilly hikes or camping trips. The moisture-wicking fabric actively pulls sweat away from your skin, ensuring you stay dry and comfortable. Additionally, they dry quickly, making them perfect for holiday adventures or washing after a long day in nature. Lightweight and easy to pack, these trousers offer convenience for any active lifestyle.

The adam & eesa Thermal Bottoms are designed to keep you warm and comfortable during cold weather activities. Available in a variety of colours and sizes, they ensure a perfect fit for any body type. The ultra-soft and lightweight thermal material provides a smooth touch and is kind to your skin, reducing irritation. With excellent elasticity, these leggings allow for freedom of movement, making them ideal for running or workouts. Additionally, the quick-dry fabric keeps you active even in freezing temperatures.