Best Polyester Thermal Bottoms for Women of 2025

The SIMIYA Thermal Leggings are designed to keep you warm and comfortable during the cold winter months. Made from a soft blend of 95% polyester and 5% spandex, these leggings feel like a second skin without adding bulk. They feature moisture-wicking and breathable fabric, ensuring you stay dry and free from clamminess. With a four-way stretch design, you can enjoy complete freedom of movement, whether you're at home or engaging in outdoor activities. Plus, they are versatile enough to be worn under ski pants or during winter sports.

The Keanu Thermal Bottoms are a stylish and functional choice for winter wear. Featuring a brushed inner fabric, they provide excellent heat retention, ensuring you remain warm during chilly days and nights. The lightweight design with a 0.45 TOG rating allows you to enjoy thermal comfort without feeling bulky. Made with eco-friendly materials, these bottoms are not only durable but also a responsible choice for your wardrobe. With a chic heart pattern, they elevate your winter essentials while offering great value in a convenient pack of three.

The Gaffer Thermal Bottoms are designed to keep you warm during the chilly months. Made from a lightweight blend of 80% polyester and 20% viscose, these long johns provide excellent insulation without feeling bulky. Their fantasy slim fit and natural breathability ensure you can move comfortably, whether you're indoors or outdoors. With their anti-static and anti-fluff properties, you can enjoy a neat appearance while layering them under your clothes for added warmth during winter sports or as cosy home wear.

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 iTRONiK Thermal Panties are designed with your comfort in mind, making them perfect for cold days and nights. Made in the UK, these breathable panties feature a subtle pattern and ventilated holes to enhance airflow, keeping you cosy without overheating. Constructed from polyester, they offer durability while being soft against your skin. With a wide range of sizes from S to XXXL, you can easily find the perfect fit to suit your needs.

The Adore Thermal Long Johns are designed to keep you warm and comfortable during colder days. They are brushed for extra warmth, providing a soft feel against your skin. The heat trap technology ensures that body heat is retained, making them perfect for chilly weather. Available in classic colours like White or Charcoal, these long johns are made from a blend of 50% cotton and 50% polyester, offering both comfort and durability. Plus, they're machine washable, making them easy to care for and maintain.

The TNNZEET Thermal Leggings are designed for ultimate comfort during the colder months. Made from ultra-soft fabric, they feature a blend of polyester and spandex, ensuring they are non-see-through and skin-friendly. The thermal fleece lining traps heat effectively, keeping you warm in chilly weather. With a high-waisted design and a wide waistband, these leggings provide excellent tummy control and stay in place during movement. Their 4-way stretch offers maximum flexibility, making them perfect for any activity.