I wouldn't say this is short. Most of this info would be on the landing page, right? So why spell it out in the ad?

Agreeing with /u/theoddwillow here. Most mattresses are supposed to be comfortable and promote good sleep. And they're not exactly hard to set up.

So think of it this way: how are you different from any other mattress in a box, really? Is it price? Is it materials? Maybe you have tons of 5 star reviews from customers, or a testimonial from a sleep expert.

If you don't know yet — that's fine. But my advice is: start experimenting with different angles. That way you'll know what messaging works, and you can keep your copy super tight going forward.