The number on the chest states "1.4 skinfoil summer." It’s Assos’ way of letting you know that the SS.skinFoil_Summer_s7 is the summer under shirt. SS stands for short sleeve, and 1 is for summer, so know you know the style and the season.
But there is much more to this foundation. Since the crew at Assos rides in Switzerland year ‘round, they utilize baselayers year ‘round. When done right, a good one keeps you cooler in the heat, and warmer in the cold. The idea behind this is fairly simple: the microclimate between your skin and your outer layer dictates what you feel against your body. If that climate is dry, you’ll feel better. In the summer, this means bigger pockets of air created by the garment, hence the larger holes in the mesh.
But for this to work, the under shirt has to fit like a second skin. Assos makes this very stretchy, and you shouldn’t be afraid to have it feel a bit tight when you first put it on. It also has to wick. Assos gets the faster pulling of sweat away from the body by both the fiber composition, the 3D knit, and the sizes and shapes of the mesh.
At the top, the neck is a subtle V for more air flow. Beneath, is a slightly more dense section which features the 1.4 label, one of four seasons, the first, summer. The torso itself is one piece, with zones of lesser and more dense mesh patterns for optimum moisture control. The center of the back has big holes while the sides are a bit more dense. The front and back are different by design because of how air flows over the body, how the jersey does and doesn’t help with cooling.
They recommend this for hot days, which they put at 70-degrees Fahrenheit and above. Your experience may vary. It also can be used next to the skin with a heavier base layer pulled on top, extending the temperature range of heavier garments while keeping the arms flexible.
If you’re familiar with Assos undershirts, this updates Assos’ SS.skinFoil_summer.
The Assos SS.skinFoil_summer_s7 is the hot weather foundation top for those who prefer sleeves.