Sparco K-Carbon Long Sleeve Top

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Size/Fitting guide

SKU: SKW002202 Category: Karting Underwear

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The Sparco K-Carbon long sleeve top, from their karting underwear range. Part number SKW002202.

Made from a highly breathable material that helps regulate body temperature, with a moisture wicking construction that pulls sweat away from the skin, and an anti bacterial finish so it stays fresh between meetings. Ergonomically cut so it does not bunch at the shoulder under a kart suit.

That last point is the practical one. A base layer that rides up or gathers under a suit is worse than no base layer, because a fold of fabric under a shoulder strap becomes a sore spot within a session.

The approval

This is not FIA approved and it is not intended to be. Karting works to its own regulations and most classes do not specify homologated underwear, which is why a technical base layer like this is the sensible choice: it is doing a comfort and temperature job rather than a fire protection one.

If your class does specify approved underwear, tell us and we will point you at the Nomex range instead.

Sizes, by chest measurement

Four bands, in black or white. XXS is an 89 to 97cm chest. XS to S is 98 to 105cm. M to L is 106 to 121cm. XL is 122 to 129cm.

The paired bands are normal for close fitting underwear, because the fabric takes up the difference within each band. Note that M to L is the widest of them at 15cm, so if you are near either end of it, tell us and we will check it against Sparco’s own chart before it ships.

Take a chest measurement rather than a shirt size. It is meant to fit close.

Additional information

Brand	Sparco
Approval	Non-FIA
Colour	Black, White
Size	XXS, XS-S, M-L, XL
Product Type	Karting

Karting underwear size guide

Kart underwear is sized on your body, the same chest and waist measurements as a kart suit. The complication is that this category uses four different labelling systems, sometimes within the same brand.

System	Sizes	Which products
Single letters	S, M, L, XL, XXL	OMP Padded Shorts, Alpinestars Tech KX, Sparco B-Rookie
Paired letters	XS-S, M-L, XL-XXL	The OMP KS range, Alpinestars Ride Tech
Wide pairs	S/M, L/XL, XXL/XXXL	OMP KS Winter-R tops and long johns
One size	no choice	All the balaclavas: OMP KS, Sparco Rookie and Softknit, Alpinestars Ride Tech

The quickest routeSize it from your kart suit. The letters follow the same body ladder. If you are a Sparco M kart suit you are a Sparco M top and shorts. If you have not bought the suit yet, measure your chest and waist and use those.

Measure these

AChestAround the fullest part, under the armpits, tape horizontal.

BWaistAround your natural waist, level with the navel.

CShoe sizeOnly needed for socks. They go by foot, not by clothing size.

Charts

SparcoLetters follow their body ladder.▼

Letter	Suit size	Chest (cm)	Waist (cm)
XS	44 / 46	86 – 93	74 – 81
S	48 / 50	94 – 101	82 – 87
M	52 / 54	102 – 109	88 – 97
L	56 / 58	110 – 117	98 – 105
XL	60 / 62	118 – 125	106 – 113
XXL	64 / 66	126 – 133	114 – 121

Sparco publish no separate underwear chart. These are the bands from their own body size chart, which is what their letters follow. The K-Carbon tops run XXS, XS-S, M-L and XL, so the middle two each cover two of these rows.

AlpinestarsXS to XL published, from their tech layer range.▼

Letter	Chest (cm)	Waist (cm)
XS	86 – 90	72 – 76
S	90 – 94	76 – 80
M	94 – 98	80 – 84
L	102 – 106	88 – 92
XL	106 – 110	92 – 96

Their own chart jumps from 98 cm to 102 cm between M and L, so a 98 to 102 cm chest falls in a gap. Ring us if that is you.

OMPSold in letters and pairs with no published measurements.▼

OMP put a size chart on every kart suit, boot and glove product page but not on their underwear. Rather than convert from another brand’s chart, size the KS range from your OMP kart suit size, or send us your chest and waist and we will confirm before it ships.

The KS Winter-R tops and long johns use unusually wide pairs, S/M, L/XL and XXL/XXXL, so each garment covers three suit sizes. If you are on a boundary there, take the larger.

Socks

OMP sell the KS sock in S, M and L against shoe size rather than clothing size.

Size	UK shoe	EU shoe
S	UK 6.5 – 7	EU 40 – 41
M	UK 8 – 9	EU 42 – 43
L	UK 9.5 – 10.5	EU 44 – 45

OMP publish the shoe ranges for their racing socks and the KS kart sock follows the same ladder. Kart socks are thicker than everyday ones, so if you are buying boots at the same time try them together or allow for it.

Balaclavas

Every kart balaclava we stock is one size and stretches to fit, including the OMP KS and KS Summer, the Sparco Rookie and Softknit, and the Alpinestars Ride Tech V2. There is nothing to choose. If you wear glasses, an open face style is easier to get on without dragging the arms out of place.

What this layer is for

Everything in this category is marked Non-FIA, and that is normal. Kart underwear is a comfort, wicking and abrasion layer rather than fire kit, which is the opposite of car racing underwear. What it does do is stop the suit chafing over a long day, keep you warm in winter, and add padding at the ribs where the seat works on you.

The padded shorts are the ones people underestimate. They sit between you and the seat and they are the difference between finishing a wet club meeting comfortable and finishing it bruised.

Buying a kart suit at the same time?Measure in the underwear, or order it first. A suit sized over a t-shirt and then worn over a long sleeve top and long johns is the most common reason a suit that should have fitted does not.

Falling between paired sizes?Send us your chest and waist with the range you are looking at. The paired sizing here is wide, so it is worth a check. Call 0115 989 3488 or email Sales@GSMPerformance.co.uk.

Sparco bands from sparco-official.com. Alpinestars from the size guide on their Race V3 Top Tech Layer. Sock ladder from OMP’s published racing sock ranges. OMP publish no kart underwear measurements, which is why they are not tabulated. All checked 2 August 2026.

Have you written anything about this exact product?
Yes, we have covered this exact product: Stay Dry, Stay in Control: Introducing the Sparco K-Rapid WP Kart Boots, and The Latest 2026 Sparco K-Arrow+ and K-Arrow+ WP Kart Gloves Are Now Available. That is first-hand coverage from our own builds and showroom, not brochure copy.

What is karting underwear actually for?
Comfort and temperature control rather than fire protection. A close-fitting base layer wicks sweat, stops the suit rubbing, and keeps you warm in a February practice session or cooler in August. It is not FIA fire-resistant underwear, which only matters for car racing, and our guide on fireproof underwear rules explains that side.

What size should I go for?
Sizes run from XXS to XL. Base layers work by sitting close to the skin, so if you are between sizes, take the smaller one.

How do I wash it?
After every session: cool wash, no fabric softener (it kills the wicking), air dry. It is the easiest bit of your kit to keep fresh, and doing so means the suit itself needs washing far less often.

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At GSM Performance, our priority is to maintain the utmost hygiene and quality standards for the benefit of our customers. To that end, we have instituted a policy that all purchases of long johns, balaclavas, tops, and underwear are final and non-returnable. This policy is necessary due to the personal nature of these items, which are worn in close contact with the body. This protocol is intended to guarantee the health and safety of all our customers.

This policy adheres to the best industry practices and safeguards both our customers and our staff. It's important to clarify that this policy does not affect your statutory rights as a consumer. This policy does not apply if you receive damaged or defective products. In such cases, our customer service team is available to promptly address your concerns and arrange a replacement or refund. We greatly appreciate your understanding and adherence to our hygiene policy and thank you for your continued confidence in GSM Performance. For further information please see our terms and conditions which are agreed on checkout.