In running, dressing for warm weather means eliminating the downsides of heat and sun while keeping all the benefits. That means combining lightness with moisture-wicking, while maintaining the right sporting properties — in particular optimised muscle support. A breakdown of what to wear in summer when running trail or in any other format.
Lower body: go for shorts
When the warmer months arrive and early morning cold is no longer a concern, running shorts are the go-to choice. Either way, opt for a close-fitting garment with compression and muscle support to boost performance and reduce the risk of cramps and muscle soreness. For running shorts specifically, go lightweight and comfortable — ideally with a micro-perforated fabric that delivers smooth, effective ventilation to keep you dry during effort while giving you a real sensation of lightness.
The 3D-FLEX® range from CIMALP sits firmly in the premium trail segment. Developed with input from sports medicine doctors and physiotherapists specialising in high-level sport, it meets the demands of trail runners seeking performance.
It delivers compression and muscle support for genuine performance gains and real prevention of cramps and muscle soreness. In addition, these shorts allow greater freedom of movement thanks to the highly stretch 3D-Flex® 200 fabric — slightly thicker for optimal use in cooler conditions. Finally, the
"SmartDry" fibres provide optimal moisture regulation to keep the body cool and dry, delivering perfect running comfort even in extreme heat.
Upper body: a breathable t-shirt
In the sun, t-shirts or vests are the way to go — practical for freedom of arm movement with no restriction. Look for quick-drying fabrics that keep you comfortable and wick away sweat efficiently. Bear in mind that white reflects light, and choose technical tops: they're built with special seams that prevent chafing.
The combined comfort and lightness of a versatile t-shirt in technical, lightweight Smart-Dry knit delivers perfect moisture management and better odour control thanks to an ionisation treatment. With its specific knit structure and highly stretch piqué construction, the matte surface of this quality t-shirt ensures an ultra-soft, supremely comfortable feel combined with excellent moisture transfer for breathability.
Furthermore, the flat seams "flat lock" offset construction eliminates chafing for sensitive skin and contributes to enhanced comfort.
Running socks: a genuine comfort essential
In the sun, don't head out for a run without socks! They're essential for proper foot support and, if you choose carefully, they'll also give you a genuine cooling sensation.
Make sure you choose socks with flat seams, a reinforced heel and ideally a left/right foot-specific construction. And of course, the fabric must be breathable to wick away moisture effectively.
With COOLMAX® fibre socks, you get a guaranteed cooling effect and a genuine sensation of lightness — designed for intensive use.
A cap for proper sun protection
And don't forget to protect your head properly when it's hot and you're out running! Lightweight running caps are ideal — light, airy, breathable and premium in construction: they deliver real comfort, zero irritation and disappear from your mind during effort.
Highly breathable, this cap also dries quickly so sweat doesn't get in the way — and it offers strong sun protection (UPF50). In the evening or at dawn, reflective prints keep you clearly visible even in low-light conditions.
Now that you're kitted out for the warmer months, find out what to wear for running in winter and cold weather.
