Designed to be worn beneath a caving oversuit, our thermoactive underwear helps create an effective insulating layer between the body and the protective outer suit. The fabric moves with the body while helping transport moisture away from the skin – particularly important during long, physically demanding trips underground.
Polartec Power Stretch is particularly well suited to active use where warmth must be combined with mobility and moisture management. Its stretch construction provides a close, comfortable fit without unnecessarily restricting movement when climbing, crawling, ascending ropes, or negotiating confined passages.
Our thermal underwear is suitable not only for caving and speleology, but also for other demanding outdoor activities where warmth, flexibility, and breathability are important.
Complete your underground clothing system with practical thermal accessories such as our Polartec Power Stretch balaclavas.
Available in different fabric weights, they provide additional insulation for the head and neck and can be worn beneath a caving helmet. Lightweight versions are ideal when lower bulk is preferred, while warmer Power Stretch Pro versions provide additional insulation for colder conditions.
A good caving clothing system needs to balance insulation, moisture management, freedom of movement, and protection. Thermal underwear provides the insulating inner layer, while a durable caving oversuit protects against mud, water, abrasion, and direct contact with rock.
Choosing technical fabrics designed for active use can make a significant difference to comfort during long underground trips.
Explore our caving underwear and Polartec thermal accessories and build a comfortable, flexible layering system for your next underground adventure.
