To celebrate the 40th anniversary of the hardest, most durable boots on the market, Timberland is releasing a few classic silhouettes for a special Anniversary LTD Collection. Comprised of the Super Boot, World Hiker, and the classic 6″ Yellow Boot, Timberland has upgraded each with the ultra-comfortable Vibram sole, PrimaLoft insultation, and the addition of weather-tested Gore-Tex fabric to help make sure that these boots do their job in the backwoods just as well as they show on the streets. Only 1,973 pairs have been made of each, marking the year that the original 6″ Yellow Boot was first introduced, but you’ll have to enter their auction to add a pair to your collection. Every model, from 1 to 1,973 will be put up for sale on a 10-day auction to be sold to the highest bidder with all proceeds going to the Rainforest Alliance. If you haven’t already visited the auction site, do so now — you only have about 2 days left to get in on this game.