is this made out of a webbing material ie seat belt material

Yes, it is a web type material band similar to a seat belt.

How much the thickness

As thick as a dog leash. I'm guessing about 3/16 of an inch thick

I have been having problems with my gluteus minimus muscle which seems to mimic sciatica. Does anyone know if this will help?

Was at PT today with similar symptoms...thought sciatica, but PT guru says bursitis and that this strap (she had one of this brand and showed me how to use it) would help...ordered one just now.

Color	Green
Size	35.6 x 40.6 cm
Style	Original
Weight	136 g
Material type	Nylon
Features	unframed
Batteries included?	No
Brand	OPTP
Manufacturer	OPTP
Item model number	440PS
Product Dimensions	53.34 x 40.64 x 10.16 cm; 167.83 g
ASIN	B01LXWS98E

OPTP440PS Stretch Out Strap With Stretching Exercise Poster

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