Online Retailers That Cater to the Active Guy

REI.com
I can't think of a better place to look for clothes for an active lifestyle. REI has everything--check it out.

Cabelas.com
Another terrific resource for outdoor gear. I will say though that this retailer is more geared towards hunting and fishing.

hikingandbackpacking.com
With the right clothing, you’ll be warmer, cooler, drier, and more comfortable while you’re hiking, backpacking, trail running, climbing or camping.