The size is maded according to US standard size.Please select carefully and refer to the following size chart. S 30"-32" 76-81 cm M 33"-35" 84-89 cm L 36"-38" 91-97 cm XL 39"-41" 99-104 cm XXL 42"-44" 107-112 cm

Hello, thanks for your question. Yes, those are made of 95% quality natural cotton and 5% spandex, breathable and soft to the touch. If you have any question, please feel free to contact us. Have a nice day.