How to size
SIZE CONVERSION TABLE (MEN) RIDING APPAREL 
EURO SIZE 46 48 50 52 54 56 58 60 62 64
US JACKETSIZE 36 38 40 42 44 46 48 50 52 54
US PANT SIZE 30 32 34 36 38 40 42 44 46 48
ALPHA SIZE S (30-32) M(32-34) L(36) XL(38-40) XXL(40-42) XXXL(44-46) XXXXL(46-48)
Adult Alpinestars Helmet Size Chart
Size XS S M L XL XXL
Inches 20.8-21.2 21.6-22 22.4-22.8 23.2-23.6 24-24.4 24.8-25.2
CM 53-54 55-56 57-58 59-60 61-62 63-64
Bio-7 Knee Protector Cup Size Chart
Size S M L XL
Knee Brace Size 4.17 in. - 4.49 in. 4.49 in. - 4.80 in. 4.80 in. - 5.12 in. 5.11 in. - 5.43 in.
Casual Apparel Size Chart
Size X-SMALL SMALL MEDIUM LARGE X-LARGE XX-LARGE
Chest (in.) 31 - 33 34 - 37 38 - 40 42 - 44 46 - 48 48 - 52
Waist (in.) 27 - 29 30 - 32 33 - 35 36 - 38 40 - 42 44 - 46
Knee Protector Size Chart
Size Medium Large X-Large
Joint Measurement 3.62" - 4.02" 4.02" - 4.41" 4.41" - 4.80"

Note: Joint width should be taken when the leg is in the weight bearing position

SX-1 Knee Guard Size Chart
Size SMALL/MEDIUM LARGE/X-LARGE
Knee Circumference 4" Above the Knee 15.3" - 17.7" 17.7" - 19.7"
Calf Circumference 12.6" - 14.9" 14.9" - 16.9"
Youth Foot Conversion Chart
US 10 11 12 13 1 2 3 4 5 6 7 8
Euro 28 29 30.5 32 33 34 35.5 37 38 39 40.5 42
JPN 17.5 18.5 19.5 20 21 21.5 22.5 23 24 25 25.5 23.5
ALPINESTARS ADULT RAIN JACKET SIZE CHART
SIZE (IN.) M L XL XXL
MAXIMUM CHEST 48 50 52 54
SLEEVE- COLLAR CENTER TO WRIST 35 36 37 38
BACK 28 30 30 31
ALPINESTARS ADULT RAIN PANTS SIZE CHART
SIZE (IN.) M L XL XXL
WAIST 22-26 24-30 26-32 28-34
INSEAM 31 32 33 34
ALPINESTARS ADULT RJ-3 JACKET SIZE CHART
SIZE (IN.) M L XL XXL
MAXIMUM CHEST 52 54 56 58
SLEEVE- COLLAR CENTER TO WRIST 35 36 37 38
BACK 30 30.5 31 31.5
ALPINESTARS ADULT RP-3 PANTS SIZE CHART
SIZE (IN.) M L XL XXL
MAXIMUM WAIST 32 36 38 40
INSEAM 31 32 33 33.5
ALPINESTARS ADULT TECH BACK PROTECTOR SIZE CHART
SIZE (IN.) S M L
LENGTH (top to bottom) 21 24 27
WAIST STRAP LENGTH 43 46 50
ALPINESTARS AMOK AIR DRYSTAR JACKET SIZE CHART
INTERNATIONAL SIZE SMALL MEDIUM LARGE X-LARGE XX-LARGE XXX-LARGE XXXX-LARGE
US SIZE 38 40 42 44 - 46 46 - 48 50- 52 52 - 54
ALPINESTARS BELTS SIZE CHART (UNISEX)
SIZE (IN.) S M L
WAIST 40 44 48.5
ALPINESTARS BIONIC PLUS JACKET SIZE CHART
SIZE SMALL MEDIUM LARGE X-LARGE XX-LARGE
CHEST IN. 36 - 38 38 - 40 42 44 - 46 46 - 48
ALPINESTARS CHEST PROTECTOR/ROOST GUARD SIZE CHART
SIZE X-SMALL/SMALL MEDIUM/LARGE X-LARGE
CHEST IN. 34 -38 40 - 42 44 - 46
ALPINESTARS COPPER OUT DENIM PANT SIZE CHART
WAIST SIZE 28 30 31 32 33 34 36 38 40
INSEAM IN. 29 30 30 31 31 32 32 33 34
ALPINESTARS FLEX-FIT HAT SIZE CHART
SIZE SMALL/MEDIUM LARGE/X-LARGE
FITTED HAT SIZE EQUIVALENT 6 3/4 - 7 1/4 7 1/8 - 7 5/8
ALPINESTARS GLOVE SIZE CHART
SIZE (IN.) XS S M L XL XXL XXXL
PALM CIRCUMFERENCE 7-7.5 7.5-8 8-8.5 8.5-9 9-9.5 9.5-10 10-11
ALPINESTARS JAGG/JAGG AIRFLOW LEATHER PANTS SIZE CHART
EURO SIZE 44 46 48 50 52 54 56 58 60
US WAIST SIZE 34 36 38 40 42 44 46 48 50
ALPINESTARS JAWS/T-JAWS/VALPARAISO 2 JACKET SIZE CHART
SIZE SMALL MEDIUM LARGE X-LARGE XX-LARGE XXX-LARGE XXXX-LARGE
CHEST IN. 36 - 38 38 - 40 42 44-46 46 - 48 50 - 52 52- 54
ALPINESTARS MENS' AIR FLOW JACKET SIZE CHART
SIZE (IN.) XS S M L XL XXL XXXL
CHEST 38 40 42 44 46 48 50
SLEEVE- COLLAR CENTER TO WRIST 33 34 34 35 36 37 38
WAIST 34 36 38 40 42 44 46
BACK 23.5 24 25 26 27 27.5 28
Alpinestars Men's Apparel Size Chart
ALPHA SIZE XXS XS S M L XL XXL XXXL XXXXL
US SIZE NUMERIC EQUIVALENT (IN.) 30-32 32-34 35-37 38-40 41-43 44-46 47-49 50-52 52-54
EURO SIZE (NUMERIC) 40 42 44 46 48 50 52 54 56 58 60 62 64
US SIZE (NUMERIC) 30 32 34 36 38 40 42 44 46 48 50 52 54
US PANT SIZE (NUMERIC) 24 26 28 30 32 34 36 38 40 42 44 46 48
CHEST 30.75-32.25 32.25-33.875 33.875-35.375 35.375-37 37-38.625 38.625-40.125 40.125-41.75 41.75-43.25 43.25-44.875 44.875-46.5 46.5-48 48-49.625 49.625-51.125
SLEEVE - SHOULDER TO WRIST 19.25-20.125 20.125-20.75 20.875-21.25 21.625-22 22.5-22.875 23.25-23.625 24-24.375 24.75-25.25 25.625-26 26.375-26.75 26.375-26.75 27.125-27.5 27.125-27.5
WAIST 25.25-26.75 26.75-28.375 28.375-29.875 29.875-31.5 31.5-33.125 33.125-34.625 34.625-36.25 36.25-37.75 37.75-39.25 39.25-41 41-42.5 42.5-44.125 44.125-45.625
HIP 31.125-32.625 32.625-34.25 34.25-35.875 35.875-37.375 37.375-39 39-40.5 40.5-42.125 42.125-43.75 43.75-45.25 45.25-46.875 46.875-48.375 48-375-50 50-51.625
THIGH 19.375-19.625 19.625-20.125 20.5-20.875 21.25-21.625 22-22.5 22.875-23.25 23.625-24 24.375-24.75 25.25-25.625 26-26.375 26.75-27.125 27.5-28 28.375-28.5
INSEAM 28-28.75 28.75-29.125 29.5-29.875 30.375-30.75 31.125-31.5 31.875-32.25 32.625-33.125 33.5-33.875 34.25-34.625 35-35.375 35-35.375 35.875-36.25 35.875-36.25
Alpinestars Men's Footwear Conversion
Euro 38 39 40.5 42 43 44.5 45.5 47 48 49.5 51 52
US 5 6 7 8 9 10 11 12 13 14 15 16
JPN 24 25 25.5 26.5 27.5 29 29.5 30.5 31.5 32.5 33.5 34.5
ALPINESTARS MENS' JACKET SIZE CHART
SIZE (IN.) S M L XL XXXL
CHEST 42 44 48 50 52
SLEEVE- COLLAR CENTER TO WRIST 35 35.5 36 37 37
BACK 27 28 30 31 31.5
ALPINESTARS MENS' ONE- OR TWO-PIECE SUITS AND JACKETS, EXCEPT AS LISTED BELOW:
EUROPEAN SIZE 46 48 50 52 54 56 58 60
CHEST 36" 38" 40" 42" 44" 46" 48" 50"
WAIST 30" 32" 34" 36" 38" 40" 42" 44"
SLEEVE- COLLAR CENTER TO WRIST 31-32" 32-33" 32-33" 34" 34-35" 34-35" 35-36" 36"
INSEAM 29" 30" 30" 30" 31" 32" 32" 33"
ALPINESTARS RAIDER DRYSTAR/VALPARAISO 2 DRYSTAR PANT SIZE CHART
SIZE SMALL MEDIUM LARGE X-LARGE XX-LARGE XXX-LARGE XXXX-LARGE
WAIST IN. 30-32 32-34 36 38-40 40-42 44 - 46 46 -48
INSEAM IN. 31 31 32 33 34 35 35
ALPINESTARS SMX-1/VENTED AND SMX PLUS/VENTED BOOT SIZE CHART
EURO SIZE 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
US SIZE 3.5 4 5 6 6.5 7.5 8 9 9.5 10.5 11.5 12 12.5 13.5 14
ALPINESTARS STELLA AMOK AIR DRYSTAR JACKET SIZE CHART
INTERNATIONAL SIZE SMALL MEDIUM LARGE X-LARGE XX-LARGE
US SIZE 6 8 10 12 14
ALPINESTARS STELLA T-JAWS JACKET SIZE CHART
SIZE X-SMALL SMALL MEDIUM LARGE X-LARGE XX-LARGE
US SIZE EQUIVALENT 2 4 6 8 - 10 10 - 12 14 - 16
ALPINESTARS SX-1 KNEE GUARD SIZE CHART
SIZE SMALL/MEDIUM LARGE/X-LARGE XX-LARGE
KNEE CIRCUMFERENCE 4 INCHES ABOVE THE KNEE 15.35 - 17.71 17.71 - 19.68 19.68 -
CALF CIRCUMFERENCE 12.6 - 15 15 - 17 17 -
ALPINESTARS TEMPERED DENIM JEANS SIZE CHART
WAIST SIZE IN.

28

 30 32 34 36

38
INSEAM IN. 29 30 31 32 33 33
ALPINESTARS TRACK VEST 2 SIZE CHART
SIZE X-SMALL SMALL MEDIUM LARGE X-LARGE
CHEST IN. 34 - 36 36 - 38 38 - 40 42 44 - 46
Alpinestars Women's Apparel Size Chart
EURO SIZE 36 38 40 42 44 46 48 50 52 54
ALPHA SIZE XXS XS S M L XL XXL XXXL
SIZE EQUIVALENT 0/2 2/4 6 8/10 10/12 12/14 14/16 16/18
US SIZE 0 2 4 6 8 10 12 14 16 18
US PANT SIZE (IN.) 22 24 26 28 30 32 34 36 38 40
CHEST 29.125-30.75 30.75-32.25 32.25-33.875 33.875-35.375 35.375-37 37-38.625 35.625-40.125 40.125-41.75 41.75-43.25 43.25-44.875
SLEEVE - SHOULDER TO WRIST 19.625-20.125 20.5-20.875 21.25-21.625 22-22.5 22.875-23.25 23.625-24 24.375-24.75 24.375-24.75 25.25-25.625 25.25-25.625
WAIST 22.875-24.375 24.375-26 26-27.5 27.5-29.125 29.125-30.75 30.75-32.25 32.25-33.875 33.875-35.375 35.375-37 37-38.625
HIP 32.25-33.875 33.875-35.375 35.375-37 37-38.625 38.625-40.125 40.125-41.75 41.75-43.25 43.25-44.875 44.875-46.5 46.5-48
THIGH CIRCUMFERENCE 19.625-20.125 20.5-20.875 21.25-21.625 22-22.5 22.875-23.25 23.625-24 24.375-24.75 25.25-25.625 26-26.375 26.375-27.125
INSEAM 28.375-28.75 29.125-29.5 29.875-30.375 30.75-31.125 31.5-31.875 32.25-32.625 33.125-33.5 33.125-33.5 33.875-34.25 33.875-34.25
ALPINESTARS WOMENS BOOT SIZE CONVERSION CHART
EURO SIZE 35 36 37 38 39 40 41 42 43 44
US SIZE 4 5 6 7 8 8 1/2 9 10 11 11 1/2
ALPINESTARS WOMEN'S GLOVE SIZE CHART
SIZE (IN.) XS S M L XL
PALM CIRCUMFERENCE 6.5-7 7-7.5 7.5-8 8-8.5 8.5-9
ALPINESTARS WOMENS STELLA JAWS LEATHER JACKET SIZE CHART
WOMEN'S EURO SIZE 38 40 42 44 46 48 50 52
WOMENS US SIZE 2 4 6 8 10 12 14 16
ALPINESTARS WOMENS STELLA SMX-1R BOOT SIZE CHART
EURO SIZE 36 37 38 39 40 41 42 43 44
US SIZE 5 6 7 8 8.5 9 10 11 11.5
ALPINESTARS WOMENS STELLA SONORAN AIR DRYSTAR OVERPANT SIZE CHART
INTERNATIONAL SIZE SMALL MEDIUM LARGE X-LARGE XX-LARGE
US SIZE 6 8 10 12 14
ALPINESTARS YOUTH APPAREL SIZE CHART
ALPHA SIZE S M L XL
US PANT SIZE 22 24 26 28
APPROXIMATE AGE GROUP 6-7 8-10 11-12 13-14
CHEST (IN.) 23.875-25.75 25.75-27.75 27.75-29.75 29.75-31.75
SLEEVE - SHOULDER TO WRIST 15.375-16.875 16.875-18.5 18.5-20.125 20.125-21.58
WAIST 21.25-25.75 22.875-24.375 24.375-26 26-27.5
HIP 26.75-28.375 28.375-29.875 29.875-31.5 31.5-33.125
THIGH CIRCUMFERENCE 15.75-16.5 16.5-17.375 17.375-18.125 18.125-18.875
INSEAM 20.125-22.125 22.125-24.125 24.25-26.125 26.125-28.125
ALPINESTARS YOUTH GLOVE SIZE CHART
SIZE SMALL MEDIUM LARGE X-LARGE
PALM CIRCUMFERENCE IN. 5 - 5 1/2 6 - 6 1/2 6 1/2 - 7 7 - 7 1/2
Sizes range Motocross : (Man - School)
US 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
EU 28 29 30.5 32 33 34 35.5 37 38 39 40.5 42 43 44.5 45.5 47 48 49.5 51 52
Sizes range Motocross 4W : (Lady) : Stella Tech-6
US 6 7 8 9 10
EU 37 38 39 41 42
Sizes range Road Racing - Touring (Man) : Super-Tech R - S-MX Plus - S-MX R - S-MX 4 - Vertex -Jet -Effex -Web -Roam
EU 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
US 3.5 4 5 6 6.5 7.5 8 9 9.5 10.5 11.5 12 12.5 13.5 14
Sizes range Road Racing 4W : (Lady) Stella S-MX 4
EU 35 36 37 38 39 40 41 42 43 44
US 4 5 6 7 8 8.5 9 10 11 11.5
Sizes range Riding Shoes : (Man) Ridge -Recon
US 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14
EU 34 34.5 35 35.5 36 37 37.5 38 38.5 39 40 40.5 41 42 42.5 43 43.5 44 45 45.5 46 47 47.5 48
Sizes range Riding Shoes 4W : (Lady) Stella Ridge
US 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12
EU 36 37 37.5 38 38.5 39 40 40.5 41 42 42.5 43 43.5 44
Sizes range Riding Shoes (Man) Without JPN sizes : F1 - Miglia - Smx-1 - Octane - One-O-One - Pit Shoes
US 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15
EU 34 34.5 35 35.5 36 37 37.5 38 38.5 39 40 40.5 41 42 42.5 43 43.5 44 45 45.5 46 47 47.5 48 49 49.5
Sizes Range Road Racing and Touring Boots: Super-Tech R, S-MX Plus, S-MX R, S-MX 4, Vertex, Jet, Effex, Web, Roam, Air Plus V2 Gore-Tex XCR
EU 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
US 3.5 4 5 6 6.5 7.5 8 9 9.5 10.5 11.5 12 12.5 13.5 14
ALPINESTARS MENS' JD LEATHER/ALLOY JACKET
SIZES S M L XL XXL XXXL
CHEST 40 42 44 46 48 50
SLEEVE- COLLAR CENTER TO WRIST 34 34 35 36 37 38
WAIST 35-38 37-40 39-42 41-44 43-46 45-48
BACK 24.5 25.5 26.5 27 27.5 28.5
ALPINESTARS MENS' OVERSUIT 
SIZES S M L XL XXL XXXL
CHEST 42 44 46 48 50 52
SLEEVE- COLLAR CENTER TO WRIST 36 36 36 36 37 38
WAIST 32-36 35-39 38-41 39-43 41-45 43-47
INSEAM 32 33 34 34 35 36
ALPINESTARS MENS' PANTS, EXCEPT AS LISTED BELOW:
EUROPEAN SIZE 46 48 50 52 54 56 58 60
WAIST 30" 32" 34" 36" 38" 40" 42" 44"
INSEAM 29" 30" 30" 30" 31" 32" 32" 33"
ALPINESTARS MENS' T-DYNO JACKET
SIZES S M L XL XXL XXXL
CHEST 40 42 44 46 48 50
SLEEVE- COLLAR CENTER TO WRIST 34 34 35 36 37 38
WAIST 35-38 37-40 39-42 41-44 43-46 45-48
BACK 23 24.5 25 26 26.5 27.5
ALPINESTARS MENS' TWIN LEATHER PANTS - (RUN SMALL - SEE BELOW)
SIZE 30/(46) 32/(48) 34/(50) 36/(52) 38/(54) 40/(56) 42/(58)
WAIST 28 30 32 34 36 38 40
INSEAM 31.5 32 33 33 33 34 34
OUTSEAM 42 42.5 43.5 45 45 46 47
ALPINESTARS STAPLE SOX (UNISEX)
SIZE S/M L/XL
SHOE SIZE 6 - 8.5 9-13
ALPINESTARS THERMAL RACE PANTS
SIZES S M L XL XXL
WAIST 23-26 25-28 27-30 29-32 32-36
INSEAM 29 31 32 33 34
ALPINESTARS WOMENS' JACKET/PANTS (RIDING APPAREL) SIZE CROSS REFERENCE
SIZE XXS/2 XS/4 S/6 M/8 L/10 XL/12 XXL/14
EUROPEAN 38 40 42 44 46 48 50
CHEST 30 3/4 - 32 1/4 32 1/4 - 33 7/8 33 7/8 - 35 3/8 35 3/8 - 37 37 - 38 5/8 38 5/8 - 40 40 1/8 - 41 3/4
SLEEVE- COLLAR CENTER TO WRIST 30 30 31 31 32 33 33
INSEAM 30-31 30-31 31-32 31-32 32-33 32-33 33
ALPINESTARS WOMENS' LEATHER PANTS (RIDING APPAREL)
EURO SIZE 38 (2) 40 (4) 42 (6) 44 (8) 46 (10) 48 (12) 50 (14)
WAIST 24 26 28 28 30 30 32
INSEAM 27 28 28 28 28 29 29
OUTSEAM 36 37 37 38 39 39 39
HIPS 28 30 32 34 34 36 38
Sizes range Motocross : (Man - School)
US 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
EU 28 29 30.5 32 33 34 35.5 37 38 39 40.5 42 43 44.5 45.5 47 48 49.5 51 52
Sizes range Motocross 4W : (Lady) : Stella Tech-6 
US 6 7 8 9 10
EU 37 38 39 41 42
Sizes range Riding Shoes : (Man)  Ridge -Recon
US 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5
EU 34 34.5 35 35.5 36 37 37.5 38 38.5 39 40 40.5 41 42 42.5 43 43.5 44 45 45.5 46
Sizes range Road Racing 4W : (Lady) Stella S-MX 4
EU 35 36 37 38 39 40 41 42 43
US 4 5 6 7 8 8.5 9 10 11
Sizes range Riding Shoes (Man) Without JPN sizes :  F1 - Miglia - Smx-1 - Octane - One-O-One - Pit Shoes
US 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5
EU 34 34.5 35 35.5 36 37 37.5 38 38.5 39 40 40.5 41 42 42.5 43 43.5 44 45 45.5 46
Sizes range Riding Shoes 4W : (Lady) Stella Ridge
US 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12
EU 36 37 37.5 38 38.5 39 40 40.5 41 42 42.5 43 43.5 44