High quality Nylon fabric, not the cheap polyester you may see in stores. Super cool Silver stretch holographic fabric will make your legs look fabulously shiny! . Shown in Silver, Black, Gold, White and Fuchsia. Links to other colors provided below.
Sizes XSmall-Large
Women's U.S. Sizes:
XSmall ~0 - hips - up to 34
Small ~ 2-4 - hips - 35-38
Medium ~ 6-8 - hips - 38- 41
Large ~ 10-12 - hips 41 - 44
XLarge ~ 14-16 - hips 44-47

The men's waist size below corresponds to a couple inches below most women's waist. Hip measurement is around your booty, the biggest part. There is some overlap on sizing, if you are in the middle it depends if you want a tighter or looser fit.
You are welcome to send your measurements if unsure.

for Men your waist measurement:
Small ~ 27-29
Medium ~ 30-33
Large ~ 34-37
XLarge ~ 37-40

Here are links to more colors:
Gold: https://www.etsy.com/listing/647443186/gold-holographic-leggings-burningman?ref=shop_home_active_12
Black: https://www.etsy.com/listing/677191185/black-holographic-leggings-burningman?ref=shop_home_active_1
Pearl White: https://www.etsy.com/listing/659296042/pearl-white-holographic-leggings?ref=shop_home_active_7
Fuchsia: https://www.etsy.com/listing/663357582/fuchsia-holographic-leggings-burningman?ref=shop_home_active_21&sca=1

Heavy Holographic material is made from
90% Nylon
10 % Lycra

Hand or Machine Wash Cold
Mild soap
Do Not Soak
Hang to Dry