LUCID8 Inch Full Mattress - Firm Gel Memory Foam Mattress – Bamboo Charcoal Foam –Gel Infused- Hypoallergenic Foam Mattress

Is this one of those mattresses in a box?

Is a box spring needed for the 8’ full (firm) mattress?

is the zippable cover that comes with the mattress removeable/washable?

King 2020 firm mattress without any spring/coil ? if i select only options , construction type = hybrid construction causing confusion.