What are Physio Room.com Compression Shorts (1.5mm)? Great value, thick neoprene compression base layer shorts for treatment & prevention of groin, thigh & hamstring injuries. When can I use them? For the treatment & prevention of Hamstring, Groin & Thigh injuries, such as Hamstring strains, Thigh strains, Groin strains, Osteitis Pubis, Pubalgia, Sports Hernia & Gilmores Groin. Ideal as a base layer for skiing, snowboarding & all outdoor winter sports This thick (1.5mm) version provides extra support, compression & soothing heat. Which size do I need? Measure around the waist, above the hips. If you are between sizes, please choose the larger size. Youth 60-70cm (23.5-27.5) Small 70-80cm (27.5-31.5) Medium 80-90cm (31.5-35.5) Large 90-100cm (35.5-39.5) X-Large 100-110cm (39.5-43.5) How do they work? The compression & warmth provided by Physio Room.com Compression Shorts (1.5mm) is ideal for the treatment & prevention of thigh, groin & hamstring muscle strains. The compression provides physical support & reassurance, while the therapeutic heat helps to increase & retain muscle temperature. This increases the extensibility of the tissues & reduces the risk of injury.