Under Armour Mens UA Hardtack Rubber The Under Amour&reg; UA Hardtack will keep you protected and comfortable no matter how wet or messy the conditions. 100% waterproof full-clad SEBS rubber upper. Stability-enhancing polyurethane footbed excellent underfoot comfort. Slip-resistant outsole provides excellent traction. Made in the U.S.A. Measurements: Weight: 2 lbs 1 oz Circumference: 17 3&frasl;4 in Shaft: 14 1&frasl;2 in Product measurements were taken using size 11, width D - Medium. Please note that measurements may vary by size.