what is the height of one insert

Not sure, but it was rather thin. Overall this felt like a medium firm pillow. I was looking for something more firm.

what is the material of the inserts

Hello, Insert pillow fill polyester gel fibers. These adjustable pillows are made in an OEKO-TEX Standard Certified factory that ensures textiles meet high safety and environmental standards,you can use with confidence.I hope this helps! All the best, Three Geese Customer Support

Brand	Three Geese
Color	White
Package Dimensions	44.3 x 34.11 x 14.2 cm; 1.95 kg
Material	Polyester
Special Features	Adjustable,Soft
Item Weight	1.95 Kilograms

Adjustable Layer Down Alternative Cooling Pillow. Assembled 3 in 1 Bed Pillow,Soft Pillow Good for Side and Back Stomach Sleeper,Queen Size Pack of 1

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