Sea-to-Summit Guide Map Case Made from TPU (thermoplastic polyurethane), totally welded construction and a super strong Ziploc® closure to provide fully waterproof and dustproof performance. The PVC-free TPU material is strong, durable, flexible and resistant to UV and extreme cold – so it can be folded numerous times for pocket storage without cracking or discoloring. Designed with a detachable neck strap and corner anchor points for versatility.