Icebreaker Merino Sprite Racerback Sport Bra for Hiking, New Zealand Merino Wool Elastane,Jersey,Manmade,Nylon,Wool Made in USA or Imported 83% Merino Wool/12% Nylon/5% Spandex Imported Slim fit Corespun for added durability Single back strap allows for complete range of motion Cup construction for enhanced fit and support No side seam prevents chafing