Along with socks, gloves and bladder control, umbrellas are easily lost. (especially when drinking). Which is why most of us would rather rely on a broken $3 umbrella than invest in a proper one. But if you're serious about staying dry, buy a Davek umbrella. Not only will you get stylish accessory, but also this lifetime guarantee: If it stops working for any reason, Davek will repair or replaceit for free. Just remember to bring it home after you close the tab.
