Perfect for adding resistance to a workout. · Use during any cardio training. · Adjustable in weight, they come with multiple weight packets which can be easily removed. · 20 x 0.5kg sand bags meaning you can adjust the weight from 0kg to 10kg in 0.5kg increments. · Designed to fit both men and women with their unique one size fits all double closure system. · Featuring neoprene padding throughout the chest and shoulders for total comfort.