Are the glasses BPA free?

No. they are not BPA free. The glasses are made of material hi-impact polycarbonate (PC), a type of plastic that is clear, lightweight, heat resistant, and shatter resistant. It contains PBA. According to some studies, products made of PC can release BPA due to its use and how it is cleaned. BPA are released in the containers of liquids or food, e.g. water bottles, baby bottles, etc. If you repeatedly scrub, dish-wash and boil polycarbonate baby bottles, they release BPA. Also, heating container of food made of PC will release BPA. The use and cleaning methods of glasses are less likely to release BPA than containers.

How many come in the order? Is this a pack of three?

Thanks for your questions, it is one piece of the glasses, not pack of there, the small inages under the main image is for you to see different angles and we have stated "The complete set includes a pair of sunglasses" on the product details.

Can you use these for squash?

Sorry, they can't. These glasses comply with ANSI Z87.1, but have not been tested to ASTM F3164-19, the Standard Specification for Eye Protectors for Racket Sports (Racquetball, Squash, Tennis).