The Tech-Air 5 Vest is designed to 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 5 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 5's upper operating limit of 122° F.

Alpinestars Tech-Air 5 System Size Chart

Size	Euro Size	US Size	Chest (cm)	Waist (cm)	Hip (cm)	Arm (cm)	Height (cm)
XS	40-42	30-32	78-86	64-72	79-87	49-52	150-163
SM	44-46	34-36	86-94	72-80	87-95	52-56	163-171
MD	48-50	38-40	94-102	80-88	95-103	56-60	171-179
LG	52-54	42-44	102-108	88-94	103-109	60-63	179-185
XL	54-56	44-46	108-114	94-100	109-115	63-66	185-191
2XL	58	48	114-118	100-104	115-119	66-68	191-195
3XL	60-62	50-52	118-124	104-110	119-125	66-68	191-195
4XL	62-64	52-54	124-130	110-116	125-131	68-70	195-199

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.
W Waist
Measure around your natural waistline, around the top of the hip bones, inline with the navel while keeping the measuring tape parallel to the ground.
HP Hips
Measure the circumference, from pelvic bone to pelvic bone, at the widest part of your hips below the waist.
H Height
With no shoes on, stand with your back against a wall and your feet together. Measure from the floor to the top of your head.
A Arm (Shoulder to Wrist)
Standing up straight with your arms at your sides, measure from the Acromion or summit of your shoulder, down to your wrist bone, along the outside of the arm.