Does the density preference has to do with how big a person is? Ie bigger person needs harder roller and softer one for thin person?

Density preference has to do with your sensitivity to pain and how tight your muscles are. If your muscles are really tight use a softer roller. If you don't handle pain well use a softer roller. I have a very dense roller which works great on my back but it's too hard for my shoulders which are usually very tight. This roller is soft, probably as soft they are made.

What is the foam made out of?

PVC, TPE, foam, and synthetic rubber yoga mats can be incredibly harmful for the environment and human health. They are manufactured with toxic chemicals like VOCs, azodicarbonamide, isocyanates, plasticizers, phthalates, lead, cadmium, chromium, and other heavy metals.May 17, 2022 How to Find a Non Toxic Yoga Mat + Top 7 Most Eco-Friendly ...

Color	Green
Size	1 EA
Style	18" Roller (Green)
Length	18 inches
Weight	1.33 Pounds
Material Type	100-percent-cotton-jersey
Number of Items	1
Sport	pilates
Included Components	15-minute "How To" digital workout
Batteries Included?	No
Brand	Gaiam
Department	mens
Manufacturer	Gaiam
Item model number	05-58272
Product Dimensions	16.36 x 16.36 x 46.05 cm; 290 g
ASIN	B00524WCN2

Gaiam Restore Muscle Massage Therapy Foam Rollers (18 Inch & 36 Inch)

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