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Body Paint 4.x Long-Sleeve Speed Suit - Men's

3.6666666666666665 out of 5 stars
3 Reviews


Size Chart


Body Paint 4.x Long-Sleeve Speed Suit

Castelli updates their Body Paint Speed Suit to make this key piece of time trial kit faster and more efficient than ever. Based on years of research between wind tunnel and CFD analysis as well as Team Ineos’ racing, the Body Paint 4.X Speed Suit provides aerodynamic advantages targeted for speeds above 45km/h.

Every millimeter of the Body Paint Suit is optimized to reduce drag and increase your efficiency through time trial courses. The fabric itself has a fine finish to slip through the wind, while the paneling reduces the number of external seams that would otherwise slow your speed. The fit is tight to keep the fabric next to your skin, so there’s no extraneous fabric to catch the wind. Long sleeves and short lengths provide a full-body sleek fit, which is cut for an aggressive race position.

The Body Paint Suit features several more smart touches to shave seconds off your time. Thumb loops keep the sleeves anchored and prevent them from riding up as you tuck into position. A breathable number window on the low back eliminates the need for pins, which also eliminates that number flapping in the wind. Finally, Castelli’s KISS Air2 insert provides just enough comfort without bulk to allow you to hammer through to the final stretch.


  • The fastest suit available, resulting from two years of CFD analysis
  • Developed in tandem with Team Ineos for WorldTour time trials
  • No-sew number window keeps number out of the wind
  • KISS Air2 insert provides comfort without bulk or weight
  • Optimized for speeds above 45km/h
  • Item #CSTZ7AX
[body] Power Stretch Lycra (80% polyester, 20% elastane), [back, upper sleeves] 94% polyester, 6% elastane, [lower legs] 78% polyester, 22% elastane
[small] 11in
Leg Gripper
PU grip elastic
Claimed Weight
[large] 10oz (285g)
Manufacturer Warranty
1 year

Overall Rating

3.5 based on 3 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 2 reviews
4 Stars - 0 reviews
5 Stars - 1 reviews

Fits Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

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3 out of 5 stars

November 15, 2023

Runs Super small

Size Bought:
5' 10"

Runs small just like all the reviews say. I got two sizes over standard and it's real tight. Only comfortable in the saddle, in riding position, forget walking around it's obviously not made for that. 😜

Richard P
5 out of 5 stars

July 5, 2022

tight fit

I returned this product before using it

I am 5' 10", 160lbs. Bought a L, fits great. takes time to get it on.

ama117838075 a

Originally reviewed on Backcountry.com

3 out of 5 stars

October 27, 2020

Don't believe sizing chart

I returned this product before using it

This item runs very small as another reviewer said. Believe it! Buy two sizes bigger than you measure.

Bruce K

Originally reviewed on Backcountry.com