Shell out $45 for the Ether, made with silky-soft Italian single-knit synthetic fabric, and you'll get as close to T-shirt perfection as we've seen. Our tester says, "This featherweight T kept me cool on screamin' hot summer days, dries lickety-split, and the athletic fit is just right-not baggy, but loose enough for air to circulate." After numerous hikes, trail runs, gym trips, and washings, it hasn't pilled.
Sizes: men's S-XL, women's XS-L
Weight: 4 oz.
Contact: (800) 985-6681; www.arcteryx.com.