*Size:. Medium-Large size: 56-58 cm. Large-XLarge size: 59-61 cm. Solar charging on the go. Captures solar energy from all angles without any blind spots.. Dual USB-A & USB-C ports for charging two devices simultaneously.. Lightweight at only 370 g, easy to pack.. IP65 waterproof and dust proof-rated, ideal for hiking, beach trips, fishing, and outdoor activities.. Available in two head sizes M:58/L:61 cm with adjustable hook and loop for the perfect fit.*Size:. Medium-Large size: 56-58 cm. Large-XLarge size: 59-61 cm. Solar charging on the go. Captures solar energy from all angles without any blind spots.. Dual USB-A & USB-C ports for charging two devices simultaneously.. Lightweight at only 370 g, easy to pack.. IP65 waterproof and dust proof-rated, ideal for hiking, beach trips, fishing, and outdoor activities.. Available in two head sizes M:58/L:61 cm with adjustable hook and loop for the perfect fit.