Alpinestars 8300826-3216-M S-M3 Radium Helmets Md Red
Varied thickness shell construction for optimized protection and light weight
Optimized for MX, Enduro, and Offroad use
Delivers blend of performance, protection, and comfort
Features thermo-injected shell incorporating a polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and light weight
Lightweight outer shell is constructed from impact resistant thermoplastic
Inner shell constructed with a composite fiber assembled between the outer shell and the EPS liner for maximum protection against impacts
Fit can be tailored to the rider\'s head thanks to the helmet\'s crown and cheek pads
Multiple density inner liner ensures the helmet is equipped with the correct density in the correct area for enhanced impact absorption, while also helping to reduce overall weight
6-piece EPS liner with three different densities
Polished inner EPS liner with special coating to reduce friction with comfort liner for rotational impact management
The inner and outer surfaces are engineered to minimize the effects of oblique impacts
Low friction coating is applied to the inner part of the main EPS liner to reduce the rotational acceleration forces that can result form certain oblique impacts
Maximized ventilation and high levels of heat transfer exchange thanks to ten inlets and seven exhaust ports
The visor has been designed to direct air into the ports for enhanced airflow
Visor release system ensures the visor is released with the correct pre-determined amount of force, effectively reducing the forces on the rider\'s neck during an impact
Comfort liner is constructed using recycled materials for a lower carbon footprint
Hydration tube channels are integrated into the helmet\'s cheek pads for convenience and performance
Soft textile chin strap is 25 mm for optimal safety and rider comfort
Equipped with an Emergency Release System and removable cheek pads to permit the safe and easy removal of the cheek pads while the helmet is still on, while the 3D contoured foam ensures rider comfort
Chin area optimized for superior impact performance
Stainless steel D-rings ensure a tight and secure fit
Most orders ship same day! Multi Warehouse Shipping means most orders deliver in 1-3 business days!
Returns accepted within 30 days of delivery, we supply return label.
Returns that are opened, installed or returned in a condition different than we sent (including packaging) may be subject to deduction or denial.
Alpinestars Size Charts Mens | Womens | Youth — Footwear + Apparel MENS WOMENS YOUTH Sizing is a manufacturer guide only and does not guarantee a perfect fit. Measure yourself and compare to the charts. If you are between sizes, message us with your measurements before buying. MEN\'S SIZE CHART MEN\'S FOOTWEAR CONVERSION Euro 383940.5424344.545.5474849.55152 US 5678910111213141516 JPN MEN\'S APPAREL — HOW TO MEASURE A. Chest — Around the fullest part, under the armpits, tape horizontal.
B. Waist — Around the natural waist line, in line with the navel, tape horizontal.
C. Hip — Around the fullest part of the hips, about 20 cm below the waist, tape horizontal.
D. Thigh — Around the thigh just below the crotch, tape horizontal.
E. Inseam / Inner Leg — From the crotch to the bottom of the leg.
F. Outer Arm — From shoulder (humerus) to wrist.
G. Height — From the floor to the top of the head, tape vertical. MEN\'S APPAREL SIZE CHART (INCHES) Euro Size 40424446485052545658606264 Intl Size XXSXSSMLXLXXL3XL4XL U.S. Size 30323436384042444648505254 U.S. Pant 24262830323436384042444648 A. Chest 30 3/4-32 1/432 1/4-33 7/833 7/8-35 3/835 3/8-3737-38 5/838 5/8-40 1/840 1/8-41 3/441 3/4-43 1/443 1/4-44 7/844 7/8-46 1/246 1/2-4848-49 5/849 5/8-51 1/8 B. Waist 25 1/4-26 3/426 3/4-28 3/828 3/8-29 7/829 7/8-31 1/231 1/2-33 1/833 1/8-34 5/834 5/8-36 1/436 1/4-37 3/437 3/4-39 1/439 1/4-4141-42 1/242 1/2-44 1/844 1/8-45 5/8 C. Hip 31 1/8-32 5/832 5/8-34 1/434 1/4-35 7/835 7/8-37 3/837 3/8-3939-40 1/240 1/2-42 1/842 1/8-43 3/443 3/4-45 1/445 1/4-46 7/846 7/8-48 3/848 3/8-5050-51 5/8 D. Thigh 19 3/8-19 5/819 5/8-20 1/820 1/2-20 7/821 1/4-21 5/822-22 1/222 7/8-23 1/423 5/8-2424 3/8-24 3/425 1/4-25 5/826-26 3/826 3/4-27 1/827 1/2-2828 3/8-28 1/2 E. Inseam 28-28 3/428 3/4-29 1/829 1/2-29 7/830 3/8-30 3/431 1/8-31 1/231 7/8-32 1/432 5/8-33 1/833 1/2-33 7/834 1/4-34 5/835-35 3/835-35 3/835 7/8-36 1/435 7/8-36 1/4 F. Outer Arm 19 1/4-20 1/820 1/8-20 3/420 7/8-21 1/421 5/8-2222 1/2-22 7/823 1/4-23 5/824-24 3/824 3/4-25 1/425 5/8-2626 3/8-26 3/426 3/8-26 3/427 1/8-27 1/227 1/8-27 1/2 G. Height MEN\'S APPAREL SIZE CHART (CM) Euro Size 40424446485052545658606264 Intl Size XXSXSSMLXLXXL3XL4XL U.S. Size 30323436384042444648505254 U.S. Pant 24262830323436384042444648 A. Chest B. Waist C. Hip D. Thigh E. Inseam F. Outer Arm G. Height WOMEN\'S SIZE CHART WOMEN\'S FOOTWEAR CONVERSION Euro 3738394142 US 678910 JPN 2324252626.5 WOMEN\'S APPAREL — HOW TO MEASURE A. Chest — Around the chest under the armpits, tape horizontal.
B. Bust — Around the fullest part of the bust, tape horizontal.
C. Waist — Around the natural waist line, in line with the navel, tape horizontal.
D. Hip — Around the fullest part of the hips, about 20 cm below the waist, tape horizontal.
E. Thigh — Around the thigh just below the crotch, tape horizontal.
F. Inner Leg / Inseam — From the crotch to the bottom of the leg.
G. Outer Arm — From shoulder (humerus) to wrist.
H. Height — From the floor to the top of the head, tape vertical. WOMEN\'S APPAREL SIZE CHART (INCHES) Euro Size 36384042444648505254 Intl Size XXSXSSMLXLXXL3XL U.S. Size 024681012141618 U.S. Pant 22242628303234363840 A. Chest 29 1/8-30 3/430 3/4-32 1/432 1/4-33 7/833 7/8-35 3/835 3/8-3737-38 5/838 5/8-40 1/840 1/8-41 3/441 3/4-43 1/443 1/4-44 7/8 B. Bust 30 3/4-32 1/432 1/4-33 7/833 7/8-35 3/835 3/8-3737-38 5/838 5/8-40 1/840 1/8-41 3/441 3/4-43 1/443 1/4-44 7/844 7/8-46 1/2 C. Waist 22 7/8-24 3/824 3/8-2626-27 1/227 1/2-29 1/829 1/8-30 3/430 3/4-32 1/432 1/4-33 7/833 7/8-35 3/835 3/8-3737-38 5/8 D. Hip 32 1/4-33 7/833 7/8-35 3/835 3/8-3737-38 5/838 5/8-40 1/840 1/8-41 3/441 3/4-43 1/443 1/4-44 7/844 7/8-46 1/246 1/2-48 E. Thigh 19 5/8-20 1/820 1/2-20 7/821 1/4-21 5/822-22 1/222 7/8-23 1/423 5/8-2424 3/8-24 3/425 1/4-25 5/826-26 3/826 3/4-27 1/8 F. Inner Leg 28 3/8-28 3/429 1/8-29 1/229 7/8-30 3/830 3/4-31 1/831 1/2-31 7/832 1/4-32 5/833 1/8-33 1/233 1/8-33 1/233 7/8-34 1/433 7/8-34 1/4 G. Outer Arm 19 5/8-20 1/820 1/2-20 7/821 1/4-21 5/822-22 1/222 7/8-23 1/423 5/8-2424 3/8-24 3/424 3/8-24 3/425 1/4-25 5/825 1/4-25 5/8 H. Height WOMEN\'S APPAREL SIZE CHART (CM) Official CM chart is published against 8 international sizes (not every Euro column). Intl Size XSSMLXL2XL3XL4XL A. Chest B. Bust C. Waist D. Hip E. Thigh F. Inner Leg G. Outer Arm H. Height Euro reference: 36 / 38 / 40 / 42 / 44 / 46 / 48 / 50 / 52 / 54 | U.S. 0–18 | U.S. pant 22–40 YOUTH SIZE CHART YOUTH FOOTWEAR CONVERSION Euro 282930.532333435.537383940.542 US 1011121312345678 JPN 17.518.519.5202121.522.523242525.526.5 YOUTH APPAREL — HOW TO MEASURE A. Chest — Around the fullest part, under the armpits, tape horizontal.
B. Waist — Around the natural waist line, in line with the navel, tape horizontal.
C. Hip — Around the fullest part of the hips, about 20 cm below the waist, tape horizontal.
D. Thigh — Around the thigh just below the crotch, tape horizontal.
E. Inseam — From the crotch to the bottom of the leg.
F. Arm Length — From shoulder (humerus) to wrist.
G. Height — From the floor to the top of the head, tape vertical. YOUTH APPAREL SIZE CHART (INCHES) Size 120130140150 Intl Size SMLXL U.S. Size 22242628 Years 67-89-1011-12 A. Chest 23 7/8 - 25 3/425 3/4 - 27 3/427 3/4 - 29 3/429 3/4 - 31 3/4 B. Waist 21 1/4 - 22 7/822 7/8 - 24 3/824 3/8 - 2626 - 27 1/2 C. Hip 26 3/4 - 28 3/828 3/8 - 29 7/829 7/8 - 31 1/231 1/2 - 33 1/8 D. Thigh 15 3/4 - 16 1/216 1/2 - 17 3/817 3/8 - 18 1/818 1/8 - 18 7/8 E. Inseam 20 1/8 - 22 1/422 1/4 - 24 1/424 1/4 - 26 1/826 1/8 - 28 1/8 F. Arm Length 15 6/8 - 17 3/817 3/8 - 18 7/818 7/8 - 20 1/220 1/2 - 22 G. Height 47 1/4 - 51 1/851 1/8 - 55 1/855 1/8 - 5959 - 63 YOUTH APPAREL SIZE CHART (CM) Size 120130140150 Intl Size SMLXL U.S. Size 22242628 Years 67-89-1011-12 A. Chest 60.5 - 65.565.5 - 70.570.5 - 75.575.5 - 80.5 B. Waist 54 - 5858 - 6262 - 6666 - 70 C. Hip 68 - 7272 - 7675 - 8080 - 84 D. Thigh 40 - 4242 - 4444 - 4646 - 48 E. Inseam 51.1 - 56.556.5 - 61.561.5 - 66.566.5 - 71.5 F. Outer Arm 40 - 4444 - 4848 - 5252 - 56 G. Height 120 - 130130 - 140140 - 150150 - 160 Charts compiled from the official Alpinestars size guide. International alpha sizes do not line up 1-for-1 with every Euro column on the factory charts. Always go by body measurements when possible. Fit can vary by model (race suits, MX gear, touring jackets, etc.).
