To wear this tee, just slip it on like any other shirt. It's great for casual outings or a day at the ranch. For care, you can machine wash it in cold water with like colors. Tumble dry on low to keep it in good shape. Avoid using bleach as it might damage the anti - bacterial treatment and the fabric. When ironing, use a low - heat setting. And don't worry about the sizing, it's unisex, so it'll fit a wide range of body types.