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The Tech-Air 3 Vest can be worn under any properly fitting textile jacket, keeping in mind that the jacket must be large enough to accommodate the expansion of the airbag in the event of a crash. For textile jackets, riders need 4cm of additional space around the circumference of the body. Riders who wish to wear a leather jacket that is not Tech-Air compatible must be sure that the leather jacket has an additional 4cm of space around the circumference of the entire body. Riders can also pair the Tech-Air 3 Airbag vest with any Alpinestars Tech-Air compatible jacket that features airbag expansion panels. *Not intended for use with heated riding gear; heated gear exceeds the Tech-Air 3's upper operating limit of 122° F.

For wearing over an Alpinestars jacket, choose the same size as your jacket.
For wearing over any other brand jacket, take your measurement while wearing your jacket and reference the Over Jacket Size Chart.

Over Jacket Size	Chest (cm)
XS	98-108
SM	104-114
MD	110-121
LG	116-128
XL	122-134
2XL	128-141
3XL	134-148
4XL	140-155

For wearing under any brand jacket, take your measurement while wearing only a base layer and reference the Under Jacket Size Chart.
*Note: Alpinestars does not recommend wearing a size XS or SM airbags UNDER any jacket.*

Under Jacket Size	Chest (cm)
XS	N/A
SM	N/A
MD	95-101
LG	101-107
XL	107-113
2XL	113-119
3XL	119-125
4XL	125-131

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

How to Measure

C Chest
Measure around the fullest part of your chest, under the armpits, keeping the measuring tape parallel to the ground.

Alpinestars Tech-Air 3 System Sizing

How to Measure