There are four sizes, all 2,280 mm high. The R6 measures 2,730 × 1,620 mm for up to 6 people and weighs around 2,500 kg including the foundation. The R10 measures 3,950 × 1,620 mm for up to 10 people at around 3,000 kg. The R12 measures 2,730 × 2,250 mm for up to 12 people at around 3,500 kg. The R15 measures 3,950 × 2,250 mm for up to 15 people at around 4,000 kg.
In each case the concrete foundation slab is slightly larger than the shelter and determines the footprint required. The capacity figures refer to a short stay in a standing position.