Super Heavy Resistance Bands: Cotton elastic band w/ rubber grip interior. (Level 3)
Includes 2 bands; one 2" wide & one 3" wide
 
Level 3 
This is in reference to the circumference of the band not a difference of elasticity, although the smaller the circumference could provide more resistance. 
 
Great for glute and leg activation including warm ups, body weight exercise, & a great addition to resistance/strength training.