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Alpinestars Tech KX Short Sleeve Top

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The Alpinestars Tech KX Short Sleeve Top is engineered for kart racers who demand the perfect combination of performance, comfort, and freedom of movement. This ultra-lightweight and highly breathable base layer is designed to enhance your driving experience by efficiently managing perspiration and supporting maximum flexibility.

Crafted with advanced moisture-wicking technology, the Tech KX Top helps regulate body temperature by drawing sweat away from your skin, keeping you cool and comfortable even under intense racing conditions. Its seamless, close-fit design eliminates pressure points, ensuring a distraction-free experience so you can stay fully focused on precision and control.

The innovative mesh construction promotes unrestricted movement, giving you the edge needed for quick, responsive handling. Purpose-built for competitive kart racing, the Tech KX Top provides superior breathability and exceptional comfort, helping you perform at your best. Stay cool, move freely, and experience the ultimate in performance-driven design with the Alpinestars Tech KX Top.

Key Features:

  • Ultra-Lightweight Stretch Mesh: Thin, flexible mesh enhances freedom of movement, improving agility and reducing fatigue during races.
  • Ergonomic Cut Design: Body-mapped cuts ensure unrestricted movement for precise control and handling.
  • Jacquard Mesh with Diamond Pattern: Boosts breathability while maintaining a snug, lightweight fit, allowing airflow to regulate body temperature.
  • Advanced Moisture-Wicking Technology: Effectively pulls sweat away from the skin, keeping you dry during intense racing sessions.
  • Flat Seams and Welded Hems: Minimises rubbing and chafing by reducing pressure points, delivering superior comfort for extended periods.
  • Seamless Tubular Torso Construction: Provides a smooth, bulk-free fit for optimal comfort under a race suit.
  • Enhanced Comfort Fit: Updated design tailored for kart drivers ensures a seamless feel with maximum support.

Sizing:

  • S – 89/95cm chest
  • M – 95/100cm chest
  • L – 100/106cm chest
  • XL – 106/111cm chest

Additional information

Brand

Approval

Colour

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Size

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Product Type

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.

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