Our View: The Rec Specs Maxx 31 prescription glasses work with a fully intergrated adjustable head strap and have a padded nose bridge for comfort and increased impact protection. The Rec Specs Maxx 31 are a medium to large fit so perfect for adult head sizes. Polycarbonate prescription lenses also ensure fantastic durability and impact resistance. To get the exact lens tint and frame colour you are after either call us, or select the custom build option.