The Oxford Motorcycle Compression Knitted Winter Base Layers Top is packed with features... Specifications Include: Breathable 4-way stretch knit fabric Flat lock seam construction that avoids uncomfortable pressure point Thermal properties that keep you warm when it\'s cold and cool when it\'s hot Fast wicking and fast drying Ergonomic design for an expert compression fit Muscle Supporting Fabric: 54% Polyamide 38% Polyester 8% Elastane