Unique 6 base design gives the illusion of an 8-base wrap around sports goggle. Patented SprinGuard lens retention system outperforms standard safety bevels. Meets ASTM F803 standards with standard or SprinGuard edging. Patented Lens-Lok center opening eye rim simplifies lens insertions. Perfect for basketball, tennis, racquetball, squash, soccer, and most other ball/stick sports. Available in two sizes: (1)Medium Size: A: 56, DBL: 15, B: 32. (2)Large Size: A: 60, DBL: 15, B: 34. Basic Package includes goggle with adjustable strap and black drawstring carrying pouch. NOTE: This is a NO lens option for prescription lens insertion only. Glasses cannot be worn without lenses.