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There is a reasonable degree of expansion in the Smart Jacket, and it should fit under / over most items based on your standard chest size. The only variance could be over a big, bulky touring jackets, for example. If you are planning to wear the Smart Jacket under your riding jacket, measure your chest size first wearing what you will wear when riding (base layers, t-shirt, fleece, etc.). If you are planning to wear the Smart Jacket over your riding jacket, measure your chest over the jacket.

Alpha Size	Euro Size	US Size	Chest (cm)	Waist (cm)	Height (cm)
XS	40	2	76-80	60-64	160-163
SM	42	4	80-84	64-68	163-166
MD	44-46	6-8	84-92	68-76	166-172
LG	48	10	92-96	76-80	172-175
XL	50-52	12-14	96-104	80-88	175-178
2XL	54	16	104-108	88-92	178-179

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.
B Bust
Measure around the fullest part of the bust, keeping the tape parallel to the ground.
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.
A Arm Bent (Shoulder to Wrist)
Standing up straight with your elbow bent at a 45° angle, measure from the Acromion or summit of your shoulder, down to your wrist bone along the outside of the arm.

Dainese Women's D-Air Smart Jacket Sizing

How to Measure