White-sleeve mid-sleeve sweatshirt Runner: If you are running outdoors, you can wear a hooded sweatshirt+ a lightweight down vest, and the sweatshirt hat can replace the hard-boned sports cap – just tighten the rope at the hat. It’s a show of the wind. Mountain bike, off-road: sweatshirt + windproof (rain) dual-use shirt + wool cap. Sweatshirts are best worn, and their fabrics are mostly thick and warm. Fitness in the gym: Cardigan sweatshirt + vest (or T-shirt). Running hot, you may wish to open the sweatshirt zipper, convenient and graceful.