Raide Research RaceTech Tee Men

This shirt feels so light and thin that you hardly notice it. The fabric sits airily on your skin and the vents under your armpits let extra air through. The seams are flat and smooth, so nothing chafes under a vest or belt.

It works best on the hottest days and the longest efforts. Think of a summer ultra in the Ardennes, a trail in the Alps above the tree line or a race where the sun beats down all day. On a long, hot climb you notice the difference: with a handful of ice in the pocket at your neck you cool down straight away, and your shoulders and back are protected from the sun. If it gets too warm or you want to run bare for a while, roll the shirt up into its own pocket and tuck it into your belt.

If you're unsure, think about how often and what for you'll wear it. The thin fabric is made for lightness, not rough use, so it wears faster on branches, rocks or daily rubbing under a heavy vest. In cool weather it doesn't hold any warmth. For regular training a sturdier shirt is more practical, but for hot races and ultras this is the right choice.

In short: the shirt for when it's hot and every gram counts.