Adjustable straps. Perfect for layering. Not see-through unless overstretched or worn with dark undergarments. Spandex / cotton blend. 95% cotton, 5% spandex. Approximate Measurements: Small: pit to pit is 14" Pit to bottom hem is 23.75" Med: pit to pit is 14.5" Pit to bottom hem is 24" Large: pit to pit is 14.5" Pit to bottom hem is 25" * measurements are approximate and taken while laying flat.