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Assos earlyFallInteractive Body Insulator

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Item # AAS001N

Don't worry though, we have a lot more Men's Long-Sleeve Base Layers in stock than that.

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Item # AAS001N


A quality base layer is worth every penny. They keep you warm and dry, they don't get malodorous, and they last longer than the cheap stuff. It might sting for a second to shell out for an undergarment, but amortized over many years, and combined with the greater comfort that the premium stuff yields, we know that they're well worth the investment.

The Assos earlyFallInteractive Base Layer is the lightest of the Assos long sleeve base layers. However, this doesn't mean that it's only for the warmest of cool days. Actually, it means that you need to take this into account when layering for outside. The thickness of the base layer is for better regulation of the microclimate surrounding your skin. A heavy outer-layer and a light inner-layer works on cooler days, and the light layer also works well under a lightweight long-sleeve jersey when the temperature is a touch warmer.

In contrast to the Fall and Winter base layers that have zippers, Assos gave the earlyFall a crew neck design and the lightest fabrics of the three. The body is made from a thin, wicking fabric, and there's mesh placed under the armpits for extra ventilation. Assos also abandoned the typical raglan sleeve, instead opting to cut the base layer so that the front panel, shoulders, and top of the arms are all on the same panel. For flexibility in the riding position, the underarms and back are constructed from separate panels. This eliminates any pinching or binding that you might experience with other base layers.

Further along the lines of fit, Assos designed the earlyFall to fit like a second skin. Basically, the more skin contacted, the better the thermo-regulation and wicking. The fabric employs the push-pull of a hydrophobic inner side and a hydrophilic outer. This combination rapidly moves moisture away from the skin to the outside of the undergarment for evaporation. The process keeps the skin temperature constant for consistent comfort. Assos calls this SPC.07, SkinPull Fabric. Additionally, the yarn has a carbon coating that combats the bacteria that causes odor.

The Assos earlyFallInteractive Base Layer is available in seven sizes from X-Small to TIR and in the colors Black and White.

Tech Specs

54% polyamide, 36% polyester, 8% polypropylene, 2% elastane
form fit
Recommended Use:
cool weather cycling
Manufacturer Warranty:

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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