Castelli Gabba RoS 2 Review 2026: The Go-To Cycling Jersey for UK Triathletes
What to Look For in a Cycling Jersey for UK Triathletes
British weather makes cycling clothing a year-round tactical decision. You need kit that handles a 12°C overcast morning ride, a sudden shower mid-session, and the heat of a midsummer afternoon — often on the same day. The Castelli Gabba range has dominated the “smart jersey for unpredictable weather” category since it was first launched, and the RoS 2 (Rain or Shine, second generation) is the version most UK cyclists and triathletes reach for when they need one jersey that handles everything from drizzle to direct sun.
Key Features to Consider
- Water resistance vs. waterproofing — A true waterproof jacket traps heat and kills ventilation. The Gabba RoS 2 uses a water-resistant face fabric that handles sustained light to medium rain while still breathing enough for hard efforts. For most UK riding, this is the right compromise.
- Sleeve length and coverage — Short-sleeve designs (like the Gabba RoS 2) suit warmer-base rides of 15°C+ and work well over a base layer in cooler conditions. Full-length sleeve versions are better below 10°C.
- Rear pockets — Three full-size rear pockets are essential for multi-hour training rides. Gel loops on a fourth pocket are a useful addition for triathletes who carry race nutrition.
- Fit and aerodynamics — Castelli’s cut is race-fit. It’s close to the body, which reduces drag on training rides and keeps excess fabric from flapping in the wind. Riders between sizes should size up.
Our Top Picks
Best Value: Castelli Gabba RoS Limited Print — £142.19
The original Gabba RoS in the limited print colourway offers essentially the same core performance as the RoS 2 at a significantly lower price. The water resistance, fit and pocket layout are comparable, making this the smart buy if you want the Gabba experience without paying full price. Stock is limited in this version — sizes sell out quickly at the sale price.
Best Overall: Castelli Gabba RoS 2 — from £180.00
The RoS 2 refines the original Gabba formula with updated fabric construction that feels more supple out of the box and better maintains water resistance after multiple washes. The fit is slightly more generous in the shoulders — a welcome update for athletes with a cyclist’s build who struggled with the original’s tightness across the upper back. If you’re going to own one cycling jersey that covers your entire UK training season, this is the jersey. Pair it with a thermal base layer and knee warmers and it works down to around 8°C.
Best Premium: Castelli Unlimited Perfetto RoS 2 — £260.00
If the Gabba RoS 2 is the smart jersey for variable conditions, the Perfetto RoS 2 is the full jacket for serious bad weather. It uses GORE-TEX INFINIUM WINDSTOPPER fabric on the front panels for wind and rain protection, with a stretch panel on the back for ventilation and movement. The Unlimited version adds a striking sublimation print that makes it the most visible option for early-morning training rides. The price is steep but justified for year-round UK cyclists who need performance protection rather than just shower resistance.
Buying Tips
- Castelli sizing runs snug — if you’re between sizes, go up, especially in the Gabba where the compressive fabric can restrict shoulder movement in a size too small.
- The Gabba RoS 2 works best between 10–18°C. Below 10°C, layer with a long-sleeve base. Above 18°C, it traps too much heat — switch to a ventilated jersey.
- Castelli kit is widely discounted at Tredz around the seasonal changeovers (March and September) — buy the previous season’s colourway for significant savings.
Care and Maintenance
Machine wash on a gentle cycle at 30°C and air dry — never tumble dry Gabba jerseys. The DWR (Durable Water Repellent) finish degrades with heat and harsh detergents. Restore water resistance with a wash-in DWR treatment every 10–15 washes to maintain the fabric’s performance in wet conditions.
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