Best Fabric Thermal Bottoms for Women of 2025

The Under Armour Thermal Leggings are designed as a versatile base layer, perfect for both sports and lounging. Made from super-light HeatGear fabric, they provide excellent coverage without the bulk, ensuring you stay comfortable throughout your activities. Their high-quality material effectively wicks away sweat and dries quickly, keeping you fresh. With a 4-way stretch construction, these leggings grant you the ultimate freedom of movement, allowing you to perform at your best, whether you're exercising or relaxing.

The Talus Thermal Pants by Mountain Warehouse are designed to keep you comfortable in cold weather. The moisture-wicking feature actively draws sweat away from your body, ensuring you stay dry. With isotherm technology, these pants are filled with densely packed fibres that retain warmth without added bulk. Their lightweight design makes them ideal for travel, as they are easy to pack and comfortable to wear. Additionally, they dry quickly, making them perfect for holiday wear or after washing.

SIMIYA Thermal Leggings are designed to keep you warm and comfortable during the winter months. Their snug fit acts like a second skin, trapping heat and preventing cold from seeping in. Made from super elastic fabric, these leggings allow you to move freely, making them perfect for outdoor activities or casual outings. Additionally, the moisture-wicking technology ensures you stay dry and warm, whether you're hiking or simply enjoying a chilly day outside.

The Keanu Thermal Bottoms are designed to keep you warm and stylish during cold weather. With a 0.45 TOG rating, these lightweight base layers provide excellent thermal comfort, allowing you to stay cosy without feeling weighed down. The brushed inner fabric traps warmth close to your skin, making them perfect for all-day wear. Made from an eco-friendly blend, these leggings not only offer comfort and durability but also reflect a responsible choice for your wardrobe. Enjoy the chic heart pattern while elevating your winter essentials.

The Daisy Dreamer Thermal Pants are designed for your comfort and style. The ribbed construction hugs your body, providing a snug fit that will keep you warm and cosy. With a brushed interior, these pants trap more warm air close to your skin, ensuring you stay toasty during chilly winter days. Made from pure cotton, they are not only soft and lightweight but also breathable, preventing any heat loss while you wear them. Plus, the anti-odour technology keeps your thermal pants feeling fresh, no matter how long you wear them.

The Gaffer Thermal Bottoms offer exceptional warmth and insulation, making them ideal for cold weather activities like skiing and hiking. The soft, breathable fabric keeps you comfortable throughout the day, ensuring you stay dry and cosy during intense activities. With a flexible design, these long johns allow for unrestricted movement, perfect for active pursuits or relaxing at home. This 3-pack provides excellent value, ensuring you have enough thermal layers for all your winter adventures.

The MYT Thermal Leggings are perfect for keeping warm in chilly weather. Available in a variety of waist sizes from UK 6 to 28, they ensure a comfortable fit for everyone. The pretty pointelle fabric offers a soft texture, enhancing your comfort while providing extra warmth. Ribbed cuffs at the ankles create a snug, draught-proof fit, helping you stay cosy and protected from the cold. These features make the leggings an excellent choice for winter innerwear.

The NMB Fashion Thermal Panties are crafted from high-quality thermal fabric, ensuring excellent insulation while remaining soft and breathable. This means you can enjoy everyday comfort, even in colder weather. With multiple style options, you can choose between full-length long johns and versatile panties, making them suitable for any occasion. Additionally, these thermal bottoms are made in the UK, reflecting a commitment to durability and premium quality. They are also perfect for layering, fitting smoothly under your clothing without adding bulk.

The SIHOHAN Thermal Leggings are designed for comfort and warmth. With their soft and elastic fabric, you can enjoy unrestricted movement throughout your day. The moisture-wicking material helps keep you dry by preventing sweat from reaching your skin, making them ideal for active wear. The elastic wide waistband ensures a secure fit, preventing any slipping or rolling, while the ribbed leg design keeps you warm by preventing cold air from getting in. These leggings are perfect for layering in cold weather or lounging at home.

The SINOPHANT Thermal Leggings are designed to keep you warm and comfortable during the cold winter months. They feature a super soft fleece lining that provides excellent warmth without being see-through, ensuring you feel confident in your outfit. Made from stretchy fabric, these leggings offer a snug fit while allowing for easy movement. The high-waisted design includes a wide waistband for effective tummy control, making them perfect for various activities like yoga, running, or simply lounging at home.