The first thing you will do when you get your Idle mattress is bring it to the room you will open it in. You do not want to unroll it in another room. Once you are ready to open it you can use the cutter some brands provide, if not use a scissors and be careful not to cut the fabric.
As it starts opening it will expand quickly and you will only notice a slight “new mattress smell”. The Idle mattress is made in the USA so it is not roll packed very long, which helps with minimize off gassing.
This an all natural mattress so there is no off gassing. But you will always have a “new” smell. Which dissipates.