OYT Queen Size Mattress, 10" Inch Gel Memory Foam Queen Bed Mattress in a Box with CertiPUR US Certified Foam for Sleep Supportive, Pressure Relief

Does it contain fiber glass?

Dimensions of bed?

Does it sink in after using it for a while?

My instructions say the "zipper side is the bottom." On my mattress that would mean the white side down, but in everyonesbpucs, the white side is up??