Body: 4mm (arms: 3mm) 85% Yulex® natural rubber/15% synthetic rubber by polymer content, lined with NetPlus® high-stretch 100% recycled nylon jersey in arms and lower body, 94% recycled nylon/6% spandex thermal grid in chest and back. Exterior: 87% recycled nylon/13% spandex. Natural rubber is from sources that are Forest Stewardship Council® certified by Preferred by Nature™. Made in a Fair Trade Certified™ factory