Castelli Superleggera Bib Shorts Review 2026: Worth £160 for Triathlon?
What Are the Castelli Superleggera Bib Shorts?
The Castelli Superleggera are the Italian brand’s premium lightweight bib shorts — a race-day short designed for triathletes and cyclists who want the absolute minimum between themselves and the bike on long, fast efforts. “Superleggera” means “super light” in Italian, and Castelli delivers on that promise with a featherlight Nanosilk fabric and a race-tuned chamois that prioritises power transfer over plush padding.
Key Features
- Nanosilk fabric — Castelli’s thinnest, lightest body fabric. Exceptionally breathable in summer heat, barely noticeable against the skin, but requires careful washing as it’s not as durable as heavier training shorts
- KISS2 Air chamois — A thin, smooth-top chamois optimised for aerodynamic riding position and medium-to-long efforts. Less bulky than training-oriented pads, which suits athletes sitting in a low TT position for hours
- Race-cut bib construction — High, tight bib straps keep the shorts locked in position even when you’re deep in aero position on the bike; no shifting or bunching mid-ride
- Laser-cut leg bands — No gripper elastic at the thigh, so no pressure marks or restriction. The raw-edge cuts take some getting used to for athletes new to lightweight race shorts
Performance in Training and Racing
The Superleggera feel genuinely different from training bibs the moment you sit on the saddle. The thin chamois means you feel the saddle shape more directly, which rewards athletes who have a well-fitted saddle but punishes those who don’t. On rides up to 3 hours the chamois is comfortable and non-intrusive; beyond 4 hours some athletes find them underpowered compared to thicker pads. They are at their best in the 1-2 hour race scenario, particularly 70.3 bike legs where weight and breathability matter most.
The Nanosilk fabric dries rapidly and handles summer heat better than most bib shorts in the range, which is exactly what you need on a hot race day in Weymouth, Roth or Lanzarote.
The Companion Jersey
Castelli’s Superleggera A/C Short Sleeve Jersey (£110) uses the same ultra-light mesh fabric philosophy and is designed to be paired with these shorts. The jersey features an open back panel of breathable mesh that effectively works as active ventilation at speed. If you’re investing in the bib shorts, the jersey completes a heat-management system that few other brands match at this price.
Check price on Tredz — Castelli Superleggera A/C Jersey (£110)
Verdict: Is £160 Worth It?
If your primary use case is long training rides and you want maximum chamois protection, spend £120 on the Endura FS260 bib shorts instead. If you’re targeting race-day performance — particularly 70.3 bike legs in summer heat — and you already own solid training bibs, the Castelli Superleggera are a worthwhile race-day investment. They deliver a noticeably different riding experience: lighter, cooler, more aerodynamic.
Check price on Tredz — Castelli Superleggera Bib Shorts (£160)
Care and Maintenance
Wash inside out at 30°C on a delicate cycle. Never tumble dry — the Nanosilk fabric degrades at heat. Hang dry in the shade. Avoid fabric softener, which breaks down the chamois’s antibacterial coating. Given the price, a dedicated bib-short wash bag is a worthwhile investment for protecting the fabric.
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