Quite sure (but not certain) the flooring is white oak, rift sawn, select grade, unfinished. Water-based finish after install. Sourced from Vermont Plank Flooring.

https://vermontplankflooring.com/wide-plank/white-oak/

What an incredible project - beautiful work, @ZeroEnergy Design !!! 🙌🏼 🙌🏼 🙌🏼

Thanks for being a great local flooring source @Vermont Plank Flooring