100% eco-friendly (“nature lovers”), glue-free and hypoallergenic materials.Tested and controlled by SGS (world leader in control and certification).Eco-foam interior, 100% cotton outer cover.A total of 7992 ABS (acrylonitrile butadiene styrene) plastic tips (the strong material used for Lego) are used for the set (6210 tips on the mat and 1782 on the pillow).The tips are attached without glue using a “thermosetting” process which uses heat to adhere the materials.