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 ...

Item Package Dimensions L x W x H	18 x 6.1 x 6.1 inches
Package Weight	0.3 Kilograms
Brand Name	Gaiam
Model Name	Marbled
Color	Purple
Material	Foam
Number of Items	1
Manufacturer	Fit For Life
Part Number	05-62999
Style	18" Roller (Marbled Purple)
Included Components	Foam Roller
Size	18-Inch

Gaiam Restore Foam Roller for Muscle Massage - Deep Tissue Muscle Massager for Sore Muscles & Stimulation - Total Body Pain Relief, Back, Neck, Foot, Calf, Leg, Arm (18 Inch and 36 Inch)

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