Bib Shorts

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Castelli Free Aero Race 4 Bibshort (team Version) - Black/White


This iconic bib short has been improved further still in its latest guise - a top end combo of performance and comfort, perfect for racing and serious riding

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Available Delivery Options SLXLM
UK Next Day



The Castelli Free Aero 4 Bibshort was designed with racing in mind - or at least full-on riding. That's meant minimalist construction, combining aerodynamics with comfort - the ideal blend for long hours in the saddle, both in training and for race day.

In short, these are some of Castelli's most comfortable performance shorts ever. The Free Aero 4 W Bibshort is a major step forward from previous models - Castelli's best-selling shorts ever - without sacrificing the best bits. The new leg gripper still features a lie-flat raw-cut edge and now has vertical silicone stripes to keep it securely in place without limiting the stretch.

Castelli have updated the seams for improved fit and the resulting shape makes them even more flattering than before. They've re-engineered the bib straps with new fabrics and construction so they stay cooler, lie flatter and last longer.

And let's not forget the new updated Progetto X2 Air Seamless seat pad - we're willing to bet it's the softest fabric you've ever sat on in a chammy pad.

Size Guide

Castelli Size Guide

Note: where Castelli once had a reputation for making gear that suited only very small Italian people, the Castelli women's size scale is now very similar to 'normal' UK sizing.


VeloVixen Size  Chest A Waist B Hips C Inseam D
X-Small 79cm / 31" 63cm / 25" 87cm / 34" 75cm / 29.5"
Small 84cm / 33" 68cm / 27" 92cm / 36" 76cm / 30"
Medium 89cm / 35" 73cm / 29" 97cm / 38" 77cm / 30"
Large 94cm / 37" 78cm / 31" 102cm / 40" 78cm / 30.5"
X-Large 99cm / 39" 83cm / 33" 107cm / 42" 79cm / 31"

Note: the inside leg measurement is naturally less relevant for shorts than for tights! See image below for key A-D.


VeloVixen Size Castelli Size Euro Shoe Size
Small S/M 35-38
Large L/XL 39-41
XX-Large 2XL 44-47



Diluvio, Belgian Booties
VeloVixen Size Castelli Size Euro Shoe Size
Small S/M 36-40
Large L/XL 40-44
XX-Large 2XL 44-48


All Other Shoe Covers
VeloVixen Size Castelli Size Euro Shoe Size
Small S 35-37
Medium M 37-39
Large L 40-43
X-Large XL 44-46
XX-Large 2XL 46-48



 VeloVixen Size Bras (cm) (bust | underbust) Gloves (cm) (1) Warmers (jersey size / weight)
X-Small 81-85 | 65-69 <16.6
Small 86-90 | 70-74 16.6-18.4 XS-S / 45-60kg
Medium 91-95 | 75-79 18.4-20.2 S-M / 60-70kg
Large 96-100 | 80-84 20.2-22 L-XL / 70-80kg
X-Large 101-105 | 85-89 >22 2XL / >80kg

1. Measure around your knuckles with a measuring tape 


Tech Spec

  • Vortex dimpled leg fabric for aerodynamism
  • Forza fabric for inner legs - 38% Lycra content for ideal fit
  • Stripe mesh engineered lie-flat bib strap construction to avoid overheating
  • Giro4 leg grip elastic, meaning improved grip distributed over a wider area
  • Doppio V construction in front for improved comfort
  • Flat-lock stitching
  • Progetto X2 Air Seamless Donna women-specific chamois pad
  • Recommended temperatures: 15°-35°C
  • Weight:156g

Who's Behind It?

Q. What do a 19th century Italian tailor, a designer for the Milan Ballet and the first ever lycra cycling shorts have in common?

A. They are all part of a rich 140 year history that's led to today's most recognised brand in cycling: Castelli.

Throw in a heart attack on a famous Italian climb, family feuds, Olympic gold medals and controversy in the pro peloton and it begins to sound more like a Sicilian soap opera than the backdrop to a cycling brand. But then again Castelli is no ordinary brand.

Today, Castelli's scorpion emblem is arguably the single most recognised in cycling. Iconic is an overused word these days, but the Castelli brand surely qualifies.

We first discovered Castelli on our year long ride through the Americas in 2010, when our founder Liz (pictured) wore Castelli shorts and loved them, so stocking them seemed an obvious choice. But we're almost as captivated by the story behind the name as the kit itself! For the full Castelli story (it's quite a story!), click here.

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