This tights has a long waist. I tried it in a shop the day before yesterday. My weight 172 cm, 58 kg. It's a little small for S, and M is more suitable, but I don't like it because the waist is too long. Later, I chose nike pro hypercool training series (non-tight) and started to buy M. When I tried it on, I found that the shoulders of the clothes were wider and the clothes were longer. I checked the information on the Internet and found that the M code selected by 18 1cm and 6 1kg still fit, so I chose to change it to S code, and the result was very fit. The landlord is about my age, shorter but heavier than me, which means he is older than me. Therefore, it is best to choose M for the tight-fitting series (if the landlord likes the feeling of tight-fitting, he can choose S). Sm is optional, but M is relatively comfortable and still has a sense of contraction). If it is training clothes, you can choose size S. Ps: I am so detailed mainly because some people on the Internet don't answer according to their own feelings. For example,172,60kg lets others buy L size, which makes them very angry and delays others' time. Everyone doesn't want to waste time shopping online, and wants to buy something suitable. This kind of answer is a kind of disgust to me, and it is irresponsible at all.