Heavy-Heavy Topseats are heavy-duty top seats made from W-Wood. The Topseat modules can be invisibly installed onto a third-party base structure. Only the straight Topseat model with vertical beams is self-supporting. The W-Wood® used in the Heavy-Heavy Topseats is European FSC® pine made extremely durable through a process of deep treatment with a natural wax compound. The W-Wood® used in these top seats has a similar life expectancy to FSC® hardwood, but has a lower density and hardness. The polychrome honey brown will fade very gradually to a greyer tone.