A midweight crew base layer guaranteed to warm your core, the Men&';s Midweight Crew is crafted with our 260gm Signature Blend fabric, providing enhanced 4-way stretch, superior breathability, and thermoregulation. It effectively melds the luxuriously soft on-skin properties of rayon from bamboo with the unrivalled odour resistance of merino wool. This under layer punches well above its weight in the warmth department. Material Blend 62% Rayon from Bamboo, 30% Merino Wool, 8% Elastane Weight Midweight 260gm Fit Slim Fit Core Fabric Technology Signature Blend of Merino Wool and Rayon from Bamboo Stretch 4-Way Ultra-Durable Stretch Construction Flatlock Seams, Sculpted Panels Hem Scoop Bottom Protection UPF50+ Sun Protection Certifications 100% Certified Non-Mulesed Merino Wool, Okeo-Tek 100 Certified