Put a good leather conditioner on them and then wrap them in a sealable bag with a few silica packets. Big risk is rodents. Climate controlled storage would also be preferable.
Watch the full detail series of Matt Mooreman’s GT3RS. 20 episodes long. Tons of good info here, both from Matt and Todd at Esoteric. Here’s the first video:
Original link: https://m.youtube.com/watch?v=36QlyP83nkk
thank you!