47 grams on the scale, zero seams and ventilation zones mapped to the millimeter: the Trail Racing SS T-shirt embodies the Compressport philosophy. The French compression brand has been kitting out a large share of the ultra field for years. We took it on several runs to see whether this technical top earns its place in a race pack.
© Compressport, official photo used for editorial purposes
The Trail Racing SS T-shirt is an ultralight (47 g) seamless microfiber top, with strategic mesh zones on the front, the sleeves and the upper back to maximize ventilation. It suits trail runners who want a top they forget about on long runs and who are fine with a snug, compression-style fit, but its €80 full price is steep for a simple technical tee, a sting the brand's frequent sales take away to a large extent. A serious, well-designed product, fully in line with Compressport's textile know-how.
Compressport built its reputation on one clear segment: compression apparel for endurance sports, from the calves to the upper body. The Trail Racing SS T-shirt brings that expertise to a race top designed for long distances in the mountains, with a body-mapping approach that puts mesh exactly where heat builds up most under effort.
Get this straight from the start: this isn't a casual tee. The fitted cut and built-in technologies target performance over runs lasting several hours, not relaxed everyday comfort.
In Compressport's running range, the Trail Racing SS T-shirt sits alongside the Pro Racing SS T-shirt, which leans toward road running and road racing. Both share the same targeted-ventilation philosophy. The Trail Racing adds a slightly more wrapping fit and moves its mesh zones around for mountain use, especially across the upper back under a pack, while the Pro Racing goes further on pure weight savings for racing against the clock.
| Brand | Compressport |
| Model | Trail Racing SS T-shirt |
| Fabric | 90% polyamide, 10% elastane |
| Weight | 47 g (women's size S, about 61 g in men's size M) |
| Cut | Fitted, raglan sleeves, 3D ribbing |
| Ventilation zones | Front, sleeves, upper back (mesh) |
| Construction | Seamless, anti-chafe microfiber |
| Made in | Turkey |
| Available sizes | XS to XL depending on color |
| Official price | €80, often on sale at around €56 |
Body mapping means not treating the whole garment the same way. On the Trail Racing SS T-shirt, the areas that run hottest under effort (the upper back under a pack, the front, the inside of the sleeves) get a more open mesh fabric, while the rest of the top keeps a denser microfiber for protection and hold. The result: temperature control that sacrifices neither breathability nor how well the top holds up over long hours.
RunMorph tip: the Trail Racing SS T-shirt works just as well under a hydration vest like the Nathan Pinnacle 12L as on its own for a short run. If you want an even airier singlet, the On Race Singlet 2 is an alternative worth comparing in the racing segment.
We tested the Trail Racing SS T-shirt on runs from 10 to 30 kilometers, in hot conditions and on one cooler run at altitude. Our first finding matches what several independent testers report: you forget about the top fast, with no rubbing or chafing, even after several hours under a pack with tightly cinched straps. The seamless construction delivers on that promise.
The fitted cut, on the other hand, takes some getting used to if you've never worn compression apparel. It hugs the body more than a standard running tee. That choice fits the rest of the Compressport range, but it won't suit every build or every taste. The brand's own size guide recommends sizing up if you prefer a looser fit.
On breathability, the mesh zones on the back and front of the torso wick sweat efficiently, and we saw fast drying even on the hardest sections. The raglan sleeves give you real freedom of movement, with no pulling during the repeated arm drive of uphill running. On durability, the microfiber holds its shape after several washes, with no pilling or visible stretching, which matches the brand's premium technical positioning.
One caveat deserves an honest mention: customer reviews for this model are still thin for some colors, with a decent but not unanimous average rating. Nothing that calls into question the build quality RunMorph saw in the field, but keep it in mind if you're torn between several colors or sizes before buying, especially the new shades from the SS26 collection, which have few reviews so far.
© Compressport, official photo used for editorial purposes
| Criterion | Compressport Trail Racing SS | On Race Singlet 2 |
|---|---|---|
| Format | Short-sleeve T-shirt | Sleeveless singlet |
| Weight | 47 g | Even lighter, singlet format |
| Cut | Fitted, compression | Fitted, racing |
| Ventilation | Targeted body-mapping mesh zones | General-purpose DryTec fabric |
| Recommended use | Long-distance trail, mountains | Road running, racing |
Your choice comes down mainly to terrain and weather. The On Race Singlet 2 is the better pick for road running in high heat, while the Trail Racing SS T-shirt gives you more protection under a trail pack in the mountains, especially against strap rubbing over long hours.
The Trail Racing SS T-shirt is aimed at trail runners who have already bought into Compressport's compression approach, on the calves or thighs, and want to extend it to the upper body. On long mountain runs where you wear the top for hours under a pack, this level of finish makes the difference. For occasional use or a tight apparel budget, a cheaper general-purpose technical tee will cover most of your needs without this level of detail.
To fit this kind of technical apparel into your trail or ultra prep, pair it with a RunMorph plan built around your distance and elevation gain goals. 👉 Discover RunMorph training plans.
The Trail Racing SS T-shirt confirms Compressport's textile know-how: a top that delivers on comfort and ventilation over the long haul, with a seamless construction that spares you nasty surprises on race day. The full price remains the main drawback, largely offset by the brand's recurring sales. 7.5/10: a good choice if you've already adopted compression and want a reliable top for long runs.