The fabric is a 2-thread cotton seasonal combed cotton fabric. It never leaves any knee marks - it does not shrink as long as you wash it at the degree stated on the label. We have not received any complaints regarding these. It is not lycra but it is flexible. Top length 95 cm, bottom length 105 cm. Sample size 36 - mannequin size 36. The product is a full mold WEIGHT 40-55 SIZE 36 * (SIZE S)* 55-65 SIZE 38 * (SIZE M)* 65-70 SIZE 40 * (SIZE L)* 70-75 SIZE 42 * (SIZE XL)* 75- SIZE 80 44 * (SIZE 2XL)* SIZE 80-85 46 * (SIZE 3XL)* SIZE 85-90 48 * (SIZE 4XL)* SIZE 95-100 SIZE 50 * (SIZE 5XL)* 105-115 SIZE 52 * (SIZE 5XL) SIZE)* 120-130 SIZE 54 * (SIZE 5XL)