Best Stretch Thermal Bottoms for Men of 2025

The SIMIYA Thermal Long Johns offer exceptional comfort with their fleece-lined interior, ensuring you stay warm throughout the day. The innovative free cutting design allows you to customise the length, providing a perfect fit for your needs. With double thickness knee fabrics, these long johns protect your knees from the cold, making them ideal for outdoor activities like hiking and skiing. Additionally, the 4-way stretch technology ensures you enjoy freedom of movement, whether at the gym or relaxing at home.

The 989Zé ENZO Thermal Bottoms are designed for optimum comfort and wearability, thanks to their innovative Heat Trap Technology. This feature ensures you stay warm during the cold months, making them ideal for outdoor activities. The brushed technology provides superior cold resistance compared to standard long johns, helping you enjoy your winter adventures without feeling cold. Made from a blend of 50% cotton and 50% polyester, these bottoms offer extra warmth and comfort, perfect for layering under your winter clothing.

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 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 Thermal Long Johns are designed for comfort and warmth, making them ideal for winter activities. With options available based on temperature, you can choose the right weight for your needs. The snug fit ensures that there is no bunching, helping to retain heat, while the four-way stretch fabric allows for freedom of movement. Additionally, the convenient open fly design makes it easy for you to access when nature calls, adding to the overall comfort of these thermal bottoms.

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 Panzy Thermal Bottoms offer ultimate warmth with a 0.45 TOG rating, perfect for keeping you cosy in freezing conditions. The elastic comfort fit ensures they stay snugly in place, allowing you to move freely whether you’re hiking or relaxing at home. With a functional fly/pee hole, you'll enjoy added convenience without compromising on style. Plus, the 4-way stretch fabric adapts to your movements, providing both flexibility and durability for any winter activity.

The Hestya Thermal Underwear Pants come in a convenient two-pack, ensuring you have sufficient options for daily wear and easy replacements. With multiple size choices, you can find the perfect fit, enhanced by a high stretch elastic waist for added comfort. Made from a blend of 95% polyester and 5% spandex, these pants are soft and breathable, featuring fleece lining that traps heat to keep you warm even in the chilliest conditions. Their high elasticity allows for freedom of movement, making them ideal for both outdoor activities and relaxing at home.

The orbiz Thermal Bottoms are crafted from a soft cotton and polyester blend, ensuring premium comfort while allowing breathability to keep you feeling fresh. Designed for heat retention, these thermal leggings help wick away moisture, maintaining a comfortable temperature throughout the day. Their highly flexible fabric provides a snug fit that moves with you, eliminating the discomfort of excess material. Ideal for outdoor activities, these thermal pyjamas act like a second skin, offering warmth and freedom of movement during the cold winter months.

The ZRWASKA Thermal Leggings are designed to keep you warm during winter. Available in various sizes and colours, these long johns fit comfortably and provide essential warmth with a TOG rating of 0.45. The cotton and polyester blend ensures moisture-wicking properties, making them ideal for winter loungewear or as an underlayer during outdoor activities. With their four-way stretch fabric, you can move freely while staying warm, perfect for skiing, hiking, or simply relaxing at home.