LIFA® ACTIVE is a performance base layer, delivering superior moisture management and lightweight insulation for all your outdoor activities. The LIFA® ACTIVE Stripe Crew has an advanced 2-layer construction with 100% LIFA® fiber next to skin and wicking technical fibers outside. We added bold sleeve stripes because base layers don’t need to look basic. All in all, an unbeatable combination for moisture management, lightweight warmth and all-day comfort. Fiber Content: Shell: 65% Polyester, 35% Polypropylene