Herschel Supply Co. Glendale Hat in Green. Herschel Supply Co. Glendale Hat in Green. 100% cotton. Adjustable back strap. Print graphics. HERS-UH38. 1007 0430. Herschel supplies backpacks and bags that are modern in shape with loads of crafted detail. Inspired by the old-school American mountaineering heritage and world travel, their collection is a new twist on all your vintage favorites.