Any season, any activity HH LIFA base layers keep you warm, dry and comfortable. Our game-changing, hydrophobic LIFA yarn technology delivers light insulation and wicking moisture management. Use it for everyday wear or high-performance activities. We’ve been excelling at HH LIFA base layer technology for 40 years. Thats why our base layers are the go-to choice for professional athletes.Fiber Content: Shell: 100% Polypropylene