The source network of the picture is for reference only. Men's middle-aged and elderly cotton velvet thermal underwear looks like the picture above.
The size reference standards of men's thermal underwear are generally divided into five standards. M is suitable for men with height 160~ 170cm, waist circumference of 85~95cm and weight of 50~55kg. L is suitable for men with height 165~ 175cm, waist circumference 90~ 100cm and weight 55~60kg; Xl is suitable for men with height 170~ 180cm, waist circumference 95~ 105cm and weight 60~65kg. XXL is suitable for men with height 175~ 185cm, waist circumference 100~ 100cm and weight of 65~70kg.
The above size standards for men's thermal underwear are for reference only, because there are many thermal underwear brands, and the size of each brand is different. When purchasing, you should refer to the comparison table of men's thermal underwear size standards given by the seller, and choose the thermal underwear that suits you according to your usual clothes.