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Assos SS.skinFoil_spring Men's Base Layer

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Item # AAS0213

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Item # AAS0213


Assos created an entirely new platform for its latest generation of base layers. Called 'body insulators' by Assos, this collection replaces the previous Interactive series and focuses all of the attention toward meticulously calibrated choices of custom-designed yarn matrixes. What resulted from this new approach is called the skinFoil series of body insulators. Essentially, Assos created seven models of base layers that cover the seven ranges of climates from spring (1) to winterPlus (7). Each model within this System ClimaRange was designed to ideally complement your second layer of Assos jersey or jacket, providing you with a perfect match for your riding conditions. The SS.skinFoil_spring base layer is the lightest of the group, ideal for next-to-skin coverage within the 68 to 77 Fahrenheit range.

For the construction of the SS.skinFoil_spring base layer, Assos used its proprietary skinFoil yarns. These blended polypropylene fibers are extraordinarily light and are able to absorb, transport, and evaporate moisture much quicker than traditional poly blends. Additionally, these blended yarns form a highly elastic material that creates a push-pull effect in order to hold your muscles in place as you ride. The fabric is also antistatic and antibacterial, and it is also dermatologically tested and approved. This means you stay comfortable, fresh, and dry underneath all of your outer layers.

For this new collection of base layers, Assos decided to forego any pre-shaped paneling designs in favor of a seamless, tubular construction. The reasoning behind this is that you receive a pleasing, non-restrictive, total comfort fit. The fabric matrix is also spun, much like a sock, versus the standard flatbed knit technology, which better wraps and supports your torso than pieced-together panel designs.

The Assos SS.skinFoil_spring Base Layer is available in sizes XX-Small/x-small, Small/medium, Large/x-large, and XLG/tir (which translates to XX-large/xxx-large) and in the color White. 

Tech Specs

85% polypropylene, 15% polyester PBT
form fit
Recommended Use:
Manufacturer Warranty:
limited lifetime

Size chart

Fuji Bicycles


Geometry Chart


Altamira LTD

Seat Tube


Effective Top Tube








Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop


Chainstay Length



44 44.0cm 51.5cm


36.3cm 72.1cm


72.0 deg 75.0 deg 6.9cm 40.5cm 97.1cm
47 47.0cm 53.0cm


37.0cm 74.1cm 13.0cm 72.5 deg 74.5 deg 6.9cm 40.5cm 97.7cm
50 50.0cm 54.5cm 54.0cm 37.0cm 76.0cm 14.0cm 73.0 deg 73.5 deg 6.9cm 40.5cm 97.6cm
53 53.0cm 56.0cm 56.0cm 37.9cm 78.3cm 16.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 98.6cm
55 55.0cm 57.5cm 58.0cm 38.9cm 80.1cm 18.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 100.1cm
58 58.0cm 59.0cm 60.1cm 39.7cm 82.1cm 20.0cm 74.0 deg 73.5 deg 6.9cm 40.5cm


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