Office guest chairs: What are they?
In a sense you could say that any old chair you put in your office with the intention of having it used by guests is an office chair, but those that are actually marketed as such tend to conform to certain basic guidelines. For one thing, office chairs are rarely as elaborate or expensive as even relatively basic office chairs. They certainly aren't comparable to ergonomic office chairs or other specialized chairs.
Most chairs have a basic, simple design, with thin legs and arms so as to minimize the mass of the chair and make for easy lifting and moving; they almost never have a central base or caster-based design. Exact materials can vary; although in more affordable office guest chairs metal or plastic joints are the norms, high-end guest chairs can feature luxury wood frames.
What to look for
Lightweight materials are an excellent feature to have in chairs. This is because, in all likelihood, you will need to move your guest chairs around at least occasionally, and lightweight materials make this easier. They're especially important if you know you'll be moving the chairs frequently, like lifting and moving chairs repeatedly can create additional strain and fatigue, which you probably have enough of in the average workday.
What to avoid
Stackable guest chairs can also be a great option if you frequently have multiple guests. The best stackable chairs are compact in stacked form and can be quickly stacked and unstacked.