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Assos Spring Interactive Short Sleeve Base Layer

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Item # AAS0037

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Item # AAS0037


The defining characteristic of the Assos InterActive Spring base layer is the interActive fabric itself. The yarn is made from 3 fibers -- 2 micro hydrophilic fibers are wound with a third real silver fiber. These fibers are different in shape and form, but they're woven in such a way to provide the base layer with what Assos refers to as a "Push and Pull" effect. The pull is the way it actively moves moisture off your skin, and the push is the movement of the moisture through the fabric itself in order to facilitate evaporation.

InterActive has quite a bit more stretch than what you'll find from other base layers, giving it a second-skin feel unlike the rumpled, cottony experience of other brands. Assos keeps the seams to an absolute minimum to reduce chafing, and the cut itself is made in the same AEPD II design Assos uses in their jerseys. When you stand up in the interActive, it pulls upward at your belly button and the shoulders will feel tight. But the idea is this: with the combination of the super-stretch material and the riding-specific cut, it'll "click" into place on your torso when you reach for your bars. Don't judge it by trying it on in your bedroom -- judge it by how it feels when you ride.

The "Spring" designation of this base layer means two things: It has short sleeves (not sleeveless), and that it's made of a 190g weight interActive fabric, not the lighter material reserved for the "Summer" base layers. Assos suggests use of the Spring base layer between 57 and 72 degrees. In warmer temps, the Summer interActive is more appropriate. Available in sizes Small-TIR, in two colors -- Black and White.

As you'll note, this jersey is referred to as 2010. How is it different from the 2011 version? It has to do with the tag on the interior of the jersey at the inside of the neck. Believe it or not, US Customs required Assos to redesign their tag to better display the country of origin. Other than that, you'll get the same style, fit, and performance here as you'll find in the 2011 equivalent.

One final note: Assos base layers are not specific to men or women. They are designed to be unisex.

Size chart


Men's Apparel
Leg & Knee Warmers 0 I II
Height 4ft 11in - 5ft 2in
(150 - 159cm)
5ft 3in - 5ft 6in
(160 - 169cm)
5ft 7in - 5ft 10in
(170 - 179cm)
5ft 11in - 6ft 1in
(180 - 185cm)
6ft 1in - 6ft 3in
(186 - 190cm)
6ft 3in - 6ft 5in+
(191 - 195cm+)
XLG but wider
Arm Warmers 0 I II
Chest 35.4in
46.5+ in
How to Measure:
For best results, take measurements over your underwear.
Measure around the widest part of your chest.

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Excellent base layer for cool conditions

  • Familiarity: I've put it through the wringer

Another Assos product that did not disappoint. The fit is perfect (for me) - right against the skin without bunching or feeling constrictive. The fabric breathes and wicks well. It gets a little warm for temps over 72 F but works well as a baselayer down to the low 30's. Durable and holding up after a year of use.

2nd skin offering perfect wicking

  • Familiarity: I've used it once or twice and have initial impressions

At this price definitely pick up a white and black one to wear with different colored kits like I did. These are perfect for moderate climates to keep you warm in the cold and cool in the warm. They fit like a 2nd skin and feel like silk, as per the review below "fluid" is the perfect adjective for this baselayer.