Rectangular shape self-inflating mat, 4cm approx thickness. Orange & brown full length (198cm). Trusty old camping mattress used many many times. This was a quality purchase that I am about to donate onto the next generation. Still comfortable to sleep on (I'm 48), so easy to inflate - just roll out & a few puffs of air to top op. Quiet too (unlike some new types). Rolls up quite well for car camping/family holiday. There is certainly smaller out there for backpacking light but you won't get this level of comfort. Only donating as we need extra mats & I'll go a little wider next time. Still love this mat & this brand.