OMP Summer-K Kart Suit Black Front OMP Summer-K Junior Kart Suit From £71.50From £71.50
Alpinestars KMX-1 Kart Suit Black & White Alpinestars Super KMX-1 Kart Suit From £341.95 Incl. VATFrom £284.96 Excl. VAT

OMP Rain-K Kart Over Suit

From £58.40 Excl. VAT

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SKU: OMPKK03106 Category:

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The OMP Rain-K kart suit is manufactured from a single layer of durable & waterproof material, making it perfect for use in karting events where there’s a high likelihood of getting wet. Featuring a refined design, the Rain-K kart suit features a full-length zip closure & easy-to-use ankle belts to ensure an enhanced fit when wearing boots. Using sewn & heat welded seams, this suit is incredibly watertight and will prevent you from getting wet in any outdoor karting event.

Please note that the product provided is only a clear waterproof suit. The image shown is for promotional purposes only and depicts the waterproof suit over an OMP Summer-K karting suit which is not supplied with this product.

Key Features:

  • Manufactured From Watertight Materials
  • Ideal for Outdoor Events
  • Enhanced Design

Additional information

Brand

Approval

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Colour

Suit Size

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Suit Layers

Product Type

Karting suit size guide

Kart suits are sold three different ways on the same page. Some are on the numeric ladder, the same one that brand uses for its car suits. Some are on letters. The junior suits are sized on the child’s height in centimetres. Work out which one you are looking at first and the rest is straightforward.

System Which suits What it means
Numeric, 40 to 62 Sparco Superleggera-K and Prime-K, OMP KS-2X and KS-3X, Alpinestars KMX-5 and KMX-9 Same ladder as that brand’s car suits
Letters, XXS to XXXL Sparco Thunder, Kerb and Rookie, OMP KS-4 and Summer-K, Alpinestars Indoor Two numeric sizes per letter
Junior, 120 to 150 cm OMP Summer-K Junior Sized on the child’s height, not age

Measure these three

AChestAround the fullest part, under the armpits, tape horizontal.
BWaistAround your natural waist, level with the navel.
CHeightAgainst a wall, no shoes. This is what sizes a junior suit.

Measure over the kart underwear you will actually wear. A long sleeve top and long johns take up more room than a t-shirt, and a kart suit is cut closer than a car suit to start with.

Numeric sizes

These are the same ladders each brand uses for its car suits, so if you already own a race suit in one of these brands you know your number.

SparcoSuperleggera-K and Prime-K Advanced, 44 to 62.▼
Size Chest (cm) Waist (cm) Height (cm)
44 86 – 89 74 – 77 164 – 167
46 90 – 93 78 – 81 167 – 170
48 94 – 97 82 – 85 170 – 173
50 98 – 101 86 – 87 173 – 176
52 102 – 105 88 – 93 176 – 179
54 106 – 109 94 – 97 179 – 182
56 110 – 113 98 – 101 182 – 185
58 114 – 117 102 – 105 185 – 188
60 118 – 121 106 – 109 188 – 191
62 122 – 125 110 – 113 191 – 194
OMPKS-2X and KS-3X, 42 to 62. The widest kart range we carry.▼
Size Chest (cm) Waist (cm) Height (cm)
42 83 – 87 67 – 71 150 – 160
44 87 – 91 71 – 75 155 – 165
46 91 – 95 75 – 79 158 – 170
48 95 – 99 79 – 83 165 – 175
50 99 – 103 83 – 87 170 – 180
52 103 – 107 87 – 91 170 – 183
54 107 – 111 91 – 95 177 – 187
56 111 – 115 95 – 99 182 – 190
58 115 – 119 99 – 103 185 – 195
60 119 – 123 103 – 107 187 – 198
62 123 – 127 107 – 111 190 – 200
AlpinestarsKMX-5 V3 and KMX-9 V3, 40 to 60. Cut for a taller driver than Sparco at the same chest.▼
Size Chest (cm) Waist (cm) Height (cm)
40 78 – 82 64 – 68 150 – 156
42 82 – 86 68 – 72 156 – 163
44 86 – 90 72 – 76 163 – 167
46 90 – 94 76 – 80 167 – 171
48 94 – 98 80 – 84 171 – 175
50 98 – 102 84 – 88 175 – 179
52 102 – 106 88 – 92 179 – 183
54 106 – 110 92 – 96 183 – 187
56 110 – 114 96 – 100 187 – 191
58 114 – 118 100 – 104 191 – 195
60 118 – 122 104 – 108 191 – 195

From size 46 upwards Alpinestars add roughly a centimetre of height per size step over Sparco on almost identical chest measurements. If you are short and broad, or tall and slim, that is worth knowing before you order.

Letter sizes

Where a suit is sold in letters, each letter covers two numeric sizes. This is Sparco’s own grouping and OMP and Alpinestars follow the same pattern.

Letter Numeric Chest (cm)
XS 44 / 46 86 – 93
S 48 / 50 94 – 101
M 52 / 54 102 – 109
L 56 / 58 110 – 117
XL 60 / 62 118 – 125
XXL 64 / 66 126 – 133

The Sparco Kerb Advanced Lady runs XXS to L and is cut on the women’s block, not this one. Send us your bust, waist and height for that and we will size it properly rather than convert from a men’s chart.

Junior suits

The OMP Summer-K Junior is sized 120, 130, 140 and 150, and those numbers are the child’s height in centimetres, not their age. Ages are a rough guide only. Measure them.

Size Typical age Height (cm) Chest (cm) Waist (cm)
120 cm 6 to 7 116 – 125 60 – 63 55 – 60
130 cm 8 to 9 126 – 135 64 – 67 61 – 63
140 cm 10 to 11 136 – 145 68 – 71 64 – 67
150 cm 12 to 13 148 – 155 72 – 75 68 – 71

Body measurements from Sparco’s published youth chart, which uses the same 120 to 150 ladder. Use them as a cross-check on the height.

Do not buy a junior suit to grow intoA suit that is too long in the arm bunches at the wrist and catches on the wheel, and one that is loose across the shoulders drags every time they turn in. Size it to the measurement now. If they are right on a boundary, take the larger and turn the cuffs once.

Standards, and what they mean for choice

FIA 8877-2022 is the current kart clothing standard and Grade 1 is the higher of its two levels. It replaced the old CIK-FIA Level 2, which you will still see on older stock. Suits marked Non-CIK or Non-FIA are the rain suits, over-suits and indoor karting suits, which are not competition wear. All three appear in this category, so check the approval on the product before you buy if you are running in a championship.

What else changes the fit

Rain gear goes over the top

The OMP Rain-K and Sparco T-1 Evo wetsuit are over-suits, worn on top of everything else. Size those to go over your kart suit rather than to your own measurements, which usually means one size up.

Kart suits sit closer than car suits

There is no seat holding you in place, so a kart suit is cut to move with you rather than to sit over a harness. If you are used to a race suit it will feel tighter across the shoulders at the same nominal size, and that is correct.

Between two sizes, or buying for a child?Send chest, waist and height and tell us which suit you are looking at. Junior sizing in particular is worth a two minute conversation. Call 0115 989 3488 or email Sales@GSMPerformance.co.uk.

Numeric ladders are the manufacturers’ own published charts, the same ones used in our racing suit size guide. Sparco from sparco-official.com, OMP from their product size chart, Alpinestars from their size guide. Youth measurements from Sparco’s published youth chart. All checked 2 August 2026.

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