LHH,

It's easy to find out.

Push on a section of the seat cushion. If you see the surface wrinkle, it's leather. If it forms a uniform depression, it's vinyl.

Volvo leather is actually quite good quality. Most people ruin it by using oil, grease of tallow based products to condition it. This will destroy the pigmented top coat.

Use the Volvo Leather Care kit. It contains a very effective cleaner and protectant. The kit contains the formulas developed by Bridge of Weir, the tannery that provides Volvo leathers.

If you want to soften it, use either BMW Leather Care or Volvo Leather Softener. Neither will damage Volvo leather.

Also, wipe down the seats every couple of weeks with a damp micro-fiber cloth to remove dust and dirt.

Enjoy,
Bryan