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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	92-101
SM	96-106
MD	100-111
LG	104-116
XL	108-121
2XL	112-126

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	90-94
LG	94-99
XL	99-104
2XL	104-109

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.

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Alpinestars Women's Tech-Air 3 Air Bag Sizing

How to Measure