SmartWool PHD Women's Tech Running Tight Articulated Knitting method - Knitting method concentrates merino against skin and nylon/elastane against the elements Rear Zipped pocket - Secure back zip pocket with semi-auto locking zipper pull. Reflectivity - Reflective 17cm ankle zips with semi-auto locking slider provide 360 reflectivity. Fabrics - Knit In Vietnam Of 56% Nylon, 24% Merino Wool, 20% Elastane.