420 Spinnaker Bag is designed to be screwed into the boat with a shock cord brace on the outside. Bag has Velcro mesh pocket for all your storage needs on race day. The bag is constructed from Phifertex mesh. Phifertex mesh is 1 by 1 100% Vinyl Coated Polyester Mesh. Phifertex mesh is the only mesh with microban. Microban is antimicrobial inhibitor to prevent the growth of bacteria. Phifertex has a three year fabric warranty. Made in the USA.