Most of a wind shell's working life happens in a jersey pocket, which makes packed volume just as relevant as the weather protection. The Equipe RS Alleycat Shell Jacket S11 from Assos
folds down to about the size of a fist, which suits variable spring and fall conditions or use as a final protective layer in winter
.
For the S11 generation, every textile was updated, the seams reoriented, and the cut refined
into a silhouette Assos developed through WorldTour feedback. The job description hasn't changed: block wind and shed rain when the weather turns partway through a ride, then get out of the way when it clears.
Protection here is zoned rather than uniform.
A windproof, waterproof, and breathable 2L membrane covers the chest, shoulders, and upper back
— the surfaces taking wind and road spray first when you're down in the drops. That membrane is
Diamond Ultra, a 2L softshell built with body-mapping four-way stretch to maintain aerodynamics
, so the panel tracks with your torso instead of binding across the shoulders.
The lower sleeves switch to 575CX, which reinforces breathability and a second-skin fit
. That split matters on rolling terrain, where the front of your body needs coverage but your forearms need airflow.
Fit is the thing to get right. The AEPD racing cut is a second-skin silhouette engineered for compression and stability, which means it's built to go over a jersey and not much else. If your plan involves a thermal jersey plus a base layer underneath, size up or move to one of the insulated Equipe RS pieces instead.
An ultra-elastic, water-repellent panel wraps the stomach and lower back to maintain protection while eliminating restriction in aggressive, aerodynamic positions
, so the hem stays put when you fold forward rather than creeping up your back.
That band uses MIG, an ultralight woven textile that sheds water, increases aerodynamics, and reduces volume and weight.
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The double-slider zipper opens from both the top and the bottom, allowing ventilation during hard efforts without destabilizing the garment
. In practice that lower slider is the feature riders reach for most — it gets you into the jersey pockets underneath without stripping the jacket open at the chest.
An Eco-DWR treatment handles water repellency against light rain and road spray, and reflective details add visibility in low light
. Like any DWR finish, it responds to periodic reactivation with low heat once water stops beading. The Kosimo Granit colorway keeps the exterior muted.
Where this lands: if you race, or you ride at a pace where a loose shell audibly flaps, the Alleycat justifies its position in the range through cut and fabric zoning rather than feature count. There's no hood, no removable sleeves, no insulation — just a shaped, breathable barrier that stores small and deploys fast. Anyone who rides in genuinely cold conditions will want this as a top layer over a winter jacket, not as the whole system. The team at Excel can help sort out where it fits in your existing kit.
