The Skintec Tubes for knees made from TRI-BASE® material can be worn under any jacket. Specially developed & designed to combine flexibility & comfort with the highest level of protection. Features Breathable Elastic Flexible Equipment TRI-BASE® material contains aramid fiber for strength, cotton & elastane for comfort, & special fiber from Protex-M to prevent burns Protex-M is melt resistant & has carbonization attributes that prevent secondary injuries Prepared for protectors Good moisture transport from the body