Patagonia Yulex Wading Sock - Patagonia's comfortable, durable, neoprene-free Yulex(R) wader booties are made with 85% natural rubber and 15% synthetic rubber by polymer content. Perfect for wet wading or to wear inside of our Packable Waders or Wading Pants for extra warmth. Fair Trade Certified(TM) sewn. Minimalist design is ideal for wet wading. Wear inside of our Packable Waders or Wading Pants for increased volume and comfort in boots. Sock exterior: 2mm 85% Yulex(TM) natural rubber/15% synthetic rubber by polymer content. The natural rubber is derived from sources that are Forest Stewardship Council(R) certified by the Rainforest Alliance.