Thermal bottoms are typically made from polyester blends with added spandex/elastane, 100% silk, or cotton blended with recycled polyester.
Waist designs vary by style and include pull-on construction, full elastic waistbands, and front drawstrings for adjustability.
Thermal bottoms are offered in lightweight, midweight, and heavyweight fabrics; midweight is commonly used for insulated or lined styles.
These bottoms are described for outdoor cold-weather activities (like skiing), winter workouts or yoga, and casual wear or lounging at home.
Many thermal bottoms include stretch features such as 4-way stretch or added spandex/elastane, and product descriptions often note stretchy, flexible fabric for easy movement.
