UPDATE - we returned home after being away and found piles of sawdust under the chairs and holes in the wood frame.  Our exterminator said they are wood boring beetles.  Please read my full review below - and if you purchased the chairs, CHECK THEM CAREFULLY!!!  Wayfair took care of the matter promptly - but now I'm back shopping for new chairs and hoping nothing else was damaged :-(
original review:
Very nice and sturdy chair. Love the blue color. We ordered 4 stools. One of the backs was broken and one of the seat frames has insect damage, some sort of borer we realized was still in the wood! Wayfair was great to deal with and promptly replaced the chair.  Overall we are very pleased with them but are totally  creeped out about the insects. No damage is apparent in any of the other chair parts and we’ve been closely watching. Just wanted to share a word of warning.