Castelli Castelli Sanremo 4.1 Speed Suit

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Note: Castelli size their clothing small. For the best fit, go up one size

Product Description

The Castelli Sanremo 4.1 Speed Suit combines aero performance like a TT suit with the comfort, practicality and function needed for the road. The first Castelli speed suit in 2011 revolutionised how pro riders dressed, and the 4.1 continues this legacy, now with over a decade worth of racing and research behind it.

The speed suit is aero optimised for speeds between 30 – 55kmph. This is thanks to Castelli’s CFD-based seaming and wind tunnel fabric testing. The shoulders are constructed to air flows easily over them. Velocity Rev2 fabric on the front and sleeves also means air slips off the suit, while the elbow-length cut makes for an even slippier design. The two rear pockets have a slim design which aids aerodynamics but are wide enough for easy access in the depths of a race.

Comfort is also an essential factor for the Sanremo 4.1. the body fabrics will keep you drier and cooler than standard Lycra® and 3D mesh back help dissipate any heat with ease, making this the comfiest suit for your longest and toughest race days.

The bottom of the speed suit is based around Castelli’s pro issue Free Aero Race 4 Shorts. The short section has Castelli’s signature ‘Doppio V’ construction. Unlike standard shorts that use a single seam down the front, the ‘Doppio V’ design is two seams which cradle the body keeping everything happy. Vortex dimpled fabric on the thighs brings an aero advantage while Forza fabric on the inner legs provides the perfect fit and the Progetto X2 Air Seamless seat pad will keep you comfortable for hours in the saddle.

This version of the Sanremo 4.1 uses dyed fabrics, unlike the pro issue which uses sublimated printing. This gives a richer and deeper finish, so you’ll have a pro advantage while having an even better look.

Key Features
Engineered for aero efficiency at 30 – 55kmph
CFD-based fabric placement and seam construction
Airflow shoulder construction and Velocity Rev2 fabric on front and sleeves
3D mesh back for breathability
Doppio V construction front for support and comfort
2 rear pockets
Bottoms based off Castelli Free Aero Race 4 Shorts
Progetto X2 Air Seamless seat pad
15° – 35°C / 59°– 95°F
Weight: 232g (Large)

Occasionally, without notice, manufacturers change product design and/or specifications.

Castelli Size Chart


Castelli Clothing Sizing Guide

Use the Castelli size chart to find the best fit for you.

Note: Castelli size their clothing small. To ensure an optimal fit it is recommended you go up one size, compared to your normal cycle clothing size. 

Castelli Men's Sizing

  S M L XL 2XL 3XL
Chest 92cm 96cm 100cm 105cm 110cm 115cm
Waist 80cm 84cm 88cm 93cm 98cm 104cm
Hips 94cm 98cm 102cm 107cm 112cm 116cm
Inseam 82cm 83cm 84cm 85cm 86cm 87cm

Castelli Women's Sizing

Chest 79cm 84cm 89cm 94cm 99cm
Waist 63cm 68cm 73cm 78cm 83cm
Hips 87cm 92cm 97cm 102cm 107cm
Inseam 75cm 76cm 77cm 78cm 79cm

Read our clothing size guide for more information on sizing.

Please note, all size information is provided as a guide - if you're unsure or need any further assistance you can call us on 01792 799508 ... we're happy to help!


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Delivery & Guarantee

UK Delivery Information

International Deliveries – Temporarily Suspended 11/11/20

Note: We are still offering deliveries to the Isle of Man, Scottish Highlands, Scottish Islands, Channel Islands, Isle of Wight, Jersey and Guernsey. 

Courier Delivery update: Due to the COVID19 situation, we are currently experiencing some delays with deliveries. Our couriers are working around the clock to get your order to you as soon as possible but there is a potential delay of up to 48 hours . Please check your tracking on track your order here.

Please download the TNT Track and Trace App for iOS here and Android here so you can keep an eye on your delivery and any further updates.

Please note on the TNT tracking app it may show your delivery status as ‘Collecting’ (as per image below). This means your delivery has left our warehouse and is currently held at TNT main depot and there could be up to a 48 hour delay.

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Please keep checking the TNT tracking for further updates. On behalf of TNT we apologise for any delay and inconvenience this may cause. 

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.

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