Sleeping mats

[arbey48]

Does anyone know why sleeping mats tend to be narrower than sleeping bags?

[AyrshireAlps]

Because once you actually get in the sleeping bag, it's width reduces considerably. It only needs to be as wide as you need it, ie your physical size.

[WalkWithWallace]

Also saves weight and bulk in your pack. The rectangular shaped Exped mats are a bit more forgiving if you want a bit more space.

[arbey48]

Many thanks to you both for the simple and practical replies.
Much appreciated

[Giant Stoneater]

Maybe another reason is so that you can put the roll mat inside the sleeping bag, stops you you from rolling off it