Alpinestars Tech-Air 5 Plasma Sizing Chart

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

This chart applies to the Alpinestars Tech-Air® 5 Plasma airbag system. The Tech-Air 5 Plasma is worn under your riding jacket, so size it to your body, not your jacket. Then make sure your jacket is Tech-Air Ready, or has enough room for the airbag to inflate.

Inches:

SIZE	CHEST (IN)	WAIST (IN)	OUTER ARM (IN)	HEIGHT (IN)
XS	32 7/8-35	27 1/8-29 1/2	22 5/8-23 1/4	64 1/8-66 1/8
SM	35-37 1/4	29 1/2-31 7/8	23 1/4-23 7/8	66 1/2-68 1/2
MD	37 1/4-39 3/8	31 7/8-34 1/4	23 7/8-24 3/8	68 7/8-70 1/2
LG	39 3/8-41 1/2	34 1/4-36 1/4	24 3/8-25	70 7/8-72 1/2
XL	41 1/2-43 3/4	36 1/4-38 1/4	25 1/4-25 3/4	72 7/8-74 3/8
2XL	43 3/4-45 7/8	38 1/4-40 1/8	25 3/4-26 3/8	74 3/4-76 3/8
3XL	45 7/8-48	40 1/8-42 1/8	25 3/4-26 3/8	74 3/4-76 3/8
4XL	48-50 1/4	42 1/8-44 1/8	26 5/8-27 1/2	76 3/4-78 3/8

Centimeters:

SIZE	CHEST (CM)	WAIST (CM)	OUTER ARM (CM)	HEIGHT (CM)
XS	83.5-89	69-75	57.5-59	163-168
SM	89-94.5	75-81	59-60.5	169-174
MD	94.5-100	81-87	60.5-62	175-179
LG	100-105.5	87-92	62-63.5	180-184
XL	105.5-111	92-97	64-65.5	185-189
2XL	111-116.5	97-102	65.5-67	190-194
3XL	116.5-122	102-107	65.5-67	190-194
4XL	122-127.5	107-112	67.5-70	195-199

Fit tip: Leave your jacket's shoulder and elbow armor in place, but remove the jacket's back protector. The Tech-Air 5 Plasma has its own Nucleon Plasma back protector built in. If you fall between sizes, go by chest measurement first.

HOW TO MEASURE:

CHEST
Measure around the fullest part of your chest, under the armpits, keeping the tape horizontal.

WAIST
Measure around your natural waistline, in line with the navel, keeping the tape horizontal.

OUTER ARM
Measure from the top of your shoulder to your wrist.

HEIGHT
Stand against a wall with no shoes and have someone measure from the floor to the top of your head, keeping the tape vertical.