Body Paint 4.X Speed Suit


The Body Paint 4.X Speed Suit is the fastest we currently make, developed for WorldTour use. It's only on sale to the public as UCI insists racing tech be made commercially available, to create a level pro playing field.

Colour: Black
SKU: CS230070102
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  • Jersey - 78% Polyester 22% Elastane
  • Pant - 82% Polyester 18% Elastane
  • Rear Pocket - 76% Polyamide 24% Elastane

Being a serious time trialling suit, the Body Paint 4.X is primed to deliver marginal gains at speeds of 28m/h/45km/h and above only.

We have made sure, in the course of two years of development, during which we've conducted wind tunnel testing and hundreds of hours of CFD analysis, that cyclists capable of achieving such speeds will indeed notice the difference. Our WorldTour level athletes certainly have.

Features of the suit include a high-performance KISS Air2 seat pad, extra-long legs with endings held in place by flat grip tape, long sleeves with grip tape to stop them riding up and a cut primed to achieve best results in the extreme riding positions common to TT. There's also a breathable mesh race number window to reduce drag, with the whole suit being made from slippery material with as few seams as possible.

Testing at the Norwegian Technical University has proven the Body Paint 4.X suit to be the fastest that Castelli has ever made. All you have to decide is whether you're racing at a level to merit it. If the answer is yes, it will unleash your full competitive time trialling potential.

  • Our fastest specialist TT suit, created for use at WorldTour level
  • Refined through extensive CFT, wind tunnel and pro athlete testing
  • Proven to deliver marginal gains at speeds above 28m/h/45km/h
  • Slippery fabrics and reduced seaming help reduce drag
  • With the supportive KISS Air2 seat pad
  • Cut for a perfect fit in the TT position
  • With long arms and extra-long legs with PU grip elastic
  • Includes mesh race number window
  • Weighs 285g (L)

Temperature: 15 / 35°C