These are ONE SIZE FITS SMALL TO MEDIUM. Material feels like lightweight fleece and does not stretch like the brushed softer leggings. Measurements are taken when laid flat and unstreteched. Waist: 12.5, Hip: 19, Rise: 9.5, Inseam: 25.5, Length: 36. I'm wearing these pants VERY CAREFULLY with a 28" waist and 42.5" hips. I DO NOT SUGGEST anyone with a waist of bigger than 26" or Hips bigger than 40" purchase.