Measuring 20"x12" (51x31cm) each car shade is designed to fit most small to medium size car windows to best protect your baby from sun exposure and harmful UV rays while riding in the back seat of your vehicle. These foldable baby car window shades are the only CERTIFIED window sunshade in the market PROVEN to block 99.79% of UVA & 99.95% of UVB in the maximum category UPF 50+ (equivalent to 100 SPF).