SmartWool Women's Phd Seamless Racerback Elite Fit Bra Outer Shell - 57% Nylon, 28% Polyester, 15% Elastane; Lining: 70% Merino Wool, 20% Nylon, 10% Elastane Made in USA or Imported Machine Wash 4-Degree Elite Fit System - Exceptional construction offers excellent support and fitting. Merino Terry Loop Elasticated Banding - Positioned across the ribcage to deliver superb postural support. Sew-Free Shoulder Straps - Provide excellent air circulation and chafe-free comfort. Ribbed Knit Side Panels - Offer increased support. Interior Moulder Merino Cups - Deliver sublime next-to-skin comfort, breathability and thermoregulation.