This vest will be very useful in the coming season when jackets become too hot. My whole family has these vests, and they are lightweight, easy to move in, and can be worn for a long time. Below is the size chart from the Patagonia website. 12-18M Weight: 11-13kg Height: 84-89cm Approximate Japanese size: 85 - Brand: patagonia - Colors: Beige, Blue - Logo: patagonia - Material: Fleece - Made in: Vietnam Vest