Castelli Fast Feet 4 Socks Black

Name: Castelli Fast Feet 4 Socks Black
Brand: Castelli
SKU: 4526030010
Price: 48.8 USD
Availability: InStock

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$48.80

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CASTELLI · SIZE GUIDE

Measure with a tape and compare with the charts. For best results, measure over underwear. If you are between two sizes, choose the larger one.

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Men · Tops · Men · Bottoms · Men · Gloves · Men · Socks · Men · Shoecovers
Women · Tops · Women · Bra · Women · Bottoms · Women · Gloves · Women · Socks · Women · Shoecovers
Kids

How to measure (Castelli)

Chest: keep the tape horizontal under the arms, around the fullest part of the chest.
Waist: measure around the natural waist, not too tight (slightly loose).
Hips: measure around the fullest part of the hips with feet together.
Inseam: using pants that fit well, measure from the inseam seam down to the ankle bone.
Gloves: measure hand circumference.
Socks / Shoecovers: based on your shoe size.

MEN

Tops · Size chart (Men)

	Unit	XS	S	M	L	XL	2XL	3XL
1. Chest	cm	88	92	96	100	105	110	115
1. Chest	in	34.5	36	37.5	39	41	43	45
2. Waist	cm	76	80	84	88	93	98	103
2. Waist	in	30	31	33	34.5	36.5	38.5	40.5

Bottoms · Size chart (Men)

	Unit	XS	S	M	L	XL	2XL	3XL
1. Hips	cm	90	94	98	102	107	112	117
1. Hips	in	35.5	37	38.5	40	42	44	46
2. Inseam	cm	81	82	83	84	85	86	87
2. Inseam	in	31.8	32.2	32.8	33.2	33.5	33.8	34.2

Gloves · Size chart (Men)

	Unit	XS	S	M	L	XL	2XL
1. Hand circumference	cm	< 18.4	18.4 – 20.3	20.3 – 22.2	22.2 – 24.1	24.1 – 26	> 26
1. Hand circumference	in	< 7.2	7.2 – 8	8 – 8.7	8.7 – 9.5	9.5 – 10.2	> 10.2

Socks · Size chart (Men)

	S/M	L/XL	2XL
EU	35 – 39	40 – 43	44 – 47
US	4 – 7	8 – 10	11 – 14

Shoecovers · Size chart (Men)

	S	M	L	XL	2XL
EU	36 – 39	40 – 42	43 – 44	45 – 46	46 – 48
US	4 – 7	8 – 9	10 – 11	12 – 13	13 – 14

WOMEN

Tops · Size chart (Women)

	Unit	XS	S	M	L	XL
1. Chest	cm	79	84	89	94	99
1. Chest	in	31	33	35	37	39
2. Waist	cm	63	68	73	78	83
2. Waist	in	24.5	26.5	28.5	30.5	32.5

Bra · Size chart (Women)

	Unit	XS	S	M	L	XL
1. Chest	cm	81 – 85	86 – 90	91 – 95	96 – 100	101 – 105
1. Chest	in	32 – 33.5	34 – 35.5	36 – 37.5	38 – 39.5	40 – 41.5
2. Underbust	cm	65 – 69	70 – 74	75 – 79	80 – 84	85 – 89
2. Underbust	in	25.5 – 27	27.5 – 29	29.5 – 31	31.5 – 33	33.5 – 35

Bottoms · Size chart (Women)

	Unit	XS	S	M	L	XL
1. Hips	cm	87	92	97	102	107
1. Hips	in	34	36	38	40	42
2. Inseam	cm	75	76	77	78	79
2. Inseam	in	29.5	29.9	30.3	30.7	31.1

Gloves · Size chart (Women)

	Unit	XS	S	M	L	XL
1. Hand circumference	cm	< 16.6	16.6 – 18.4	18.4 – 20.2	20.2 – 22	> 22
1. Hand circumference	in	< 6.5	6.5 – 7.2	7.2 – 8	8 – 8.7	> 8.7

Socks · Size chart (Women)

	S/M	L/XL
EU	35 – 38	39 – 41
US	5 – 7	8 – 11

Shoecovers · Size chart (Women)

	S	M	L
EU	35 – 37	37 – 39	39 – 42
US	3 – 5	5 – 7	7 – 9

KIDS

Size chart (height + hand circumference).

	Unit	6Y	8Y	10Y	12Y	14Y
1. Height	cm	116	128	140	152	164
1. Height	ft	3.8	4.2	4.6	5	5.4
2. Hand circumference	cm	—	14.2 – 16	16 – 17.8	17.8 – 19.6	—
2. Hand circumference	in	—	5.6 – 6.3	6.3 – 7	7 – 7.7	—

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Castelli Fast Feet 4 Socks: aerodynamics and performance for racing

The Castelli Fast Feet 4 socks are designed to maximise aerodynamic efficiency during road competitions. They are part of Castelli’s Fast Feet project, developed to help save watts when every second counts. Their construction combines a foot section inspired by the Rosso Corsa socks for greater comfort inside the shoe with a ribbed Lycra® leg section that promotes airflow.

Material: Ribbed Lycra® on the leg section
Fabric technology: Aerodynamic design from Castelli’s Fast Feet project
Breathability: Structure that promotes air circulation
Fit details: Race fit with polyurethane gripper strip at the top
Weight: 48 g
Specific technology: Construction based on the Castelli Rosso Corsa Sock for improved in-shoe comfort

Aerodynamics designed to save watts

The Castelli Fast Feet 4 have been developed for cyclists looking to optimise their performance in competition. Thanks to their aerodynamic design and the combination of technical materials, these socks help improve efficiency while maintaining comfort inside the shoe under effort.

Fast Feet aerodynamic technology

These socks are part of Castelli’s Fast Feet project, designed to maximise aerodynamics in competition. Their construction is designed to help save watts in road races or when Fast Feet TT aerodynamic overshoes are not being used.

Comfort in the foot area

The foot section is based on the Castelli Rosso Corsa Sock, providing comfort and a proper fit inside cycling shoes while pedalling.

Optimised airflow

The leg area is made from ribbed Lycra®, a fabric designed to promote airflow and improve aerodynamic efficiency while riding.

Secure fit during racing

The upper section features a polyurethane gripper strip that helps keep the sock in place under effort, providing stability and a secure fit.

Sex: Men
Unisex
Women
Color: Black

Reference 4526030010-SM

ean13 8056006588327

Product Availability

Most of our items are in stock and marked on the product page as "Available. Immediate shipping".

For items with size variations, this information will appear once the appropriate option is selected. If we do not have immediate stock, the estimated delivery time will be shown. We keep this information up to date and work hard to deliver your order as soon as possible. If the item is unavailable, you can subscribe to an alert to be notified once it’s back in stock.

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We offer free shipping on most of our orders. For purchases over €100, shipping is free to countries such as Belgium, France, Germany, Luxembourg, the Netherlands, Portugal, and Spain. We do not ship to the Azores, Madeira, the Canary Islands, Reunion Island, or Guernsey..

Returns Policy

We want you to be completely satisfied with your purchase, so you have 30 days to return your order, as long as return conditions are met. You can find more information about exchanges and returns here. For hygiene and safety reasons, returns of unsealed and/or activated electronic products, food items, swimsuits, and wetsuits are not accepted. See details here.

Size Exchanges

For size-specific products, please refer to the size guide on the product page to choose the best fit. If you need a different size upon receipt of your order, you have up to 30 days to request a change. Follow the steps detailed here