What's the difference between the Blue/medium density & the Red/firm density? What does that mean?

I’m not sure of the difference. The blue ones were recommended to me by my physical therapist to aide in my recovery (which wasn’t going as speedy as I had hoped) after planter fasciitis surgery. I’ve used them daily for over 6 months, and they make a huge difference in how my feet feel.

Manufacturer	Vasyli
Part number	21
Item Weight	140 g
Product Dimensions	32 x 4.06 x 10.16 cm; 140 g
Item model number	21
Size	L
Colour	Blue
Item Package Quantity	1
Included components	Insole
Batteries included?	No
Batteries Required?	No

Vasyli 21 Custom Full Length Insoles, Blue, Large, Heel Grid Reduces Slippage, Medium Density, Biomechanical Control, Effective Pain Relief, Treats Pronation, Rearfoot Varus Angle

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