What you need to perform at top speed when the heat is on.
Marmot Kompressor Speed Pack
When you need to replace a lot of water, the Speed ($99) offers a two-liter reservoir and a 17-ounce, taste-free Hydrapak bottle (below left) in one of the smartest, simplest hydration-pack designs you’ll find.
Sugoi Titan Ice S/S Shirt
Sugoi claims that the supple, stretchy IceFil fabric reduces body heat by a whopping five degrees. That’s hard to prove, but testers reported that the shirt ($50) feels blissfully cool on the skin and wicks sweat as quickly as any lightweight synthetic shirt we’ve seen.
Think Otter Pops for athletes. Slurp one of these two-ounce sports-drink slushies ($6) before your next run to lower your core temperature a bit. Or enjoy it after the kind of intense workout that leaves you sweating even after a shower.
Balega Ultra Light No Show Socks
Smart mesh panels in these socks ($12) boost ventilation, and a sheer, foot-hugging fit minimizes bulk for faster heat transfer.
Columbia Performance Zero Arm Sleeves
We can vouch for the sunblocking power (UPF 50-plus) and the incredibly efficient sweat wicking of these thin, breathable sleeves ($35). The Omni-Freeze system—tiny blue dots that expand slightly when wet—is designed to cool your skin by amplifying the evaporative process. It works, but the effect is fleeting.
New Balance Sport Cooling Towel Pro
Chill out after a run by wetting this foamlike towel ($13) and hanging it around your neck. The hyperporous material allows for rapid evaporation, staying cool as long as it’s moist.
CW-X Stabilyx Ventilator Shorts
Even on the most scorching days, the big mesh panels over the top of the quads and the CoolMax wicking fabric (with 40-plus UPF) everywhere else kept these shorts ($80) climate controlled, while the firm compression helped our muscles stay fresh. If only they came in light, heat-reflecting colors.
Headsweats Race Hat
Just the thing to avoid cooking your noggin: a feather-light (two ounces), fast-wicking Cool-Max lid ($20) that breathes like a visor.