For Protection from the Sun - GustBuster"s SunBLOK umbrella with SunBLOK coating is ideal for beach, concerts, all outdoor activites! It"s up to 10 degrees cooler under a SunBLOK! • #1 under the Sun • Patented SunBLOK coating gives optimum skin protection; blocks 96% of harmful UVA/UVB rays • Opens to 48" arc • Temperature tested to be 10 degrees cooler under the SunBLOK • Incorporates all the patented and exclusive GustBuster construction and performance technologies • Wind-tested by College of Aeronautics to 55+ mph Arc: 43"