A sunblock with a high SPF number is the way to go when you want to block out virtually all UVA and UVB rays. Here you will find a selection of sunblock with an SPF rating of 40 or greater.
While no sunblock can offer 100% protection from the sun's rays, anything rated over 40 or 45 provides a robust 98% sun protection. So long as you are good about applying fresh coats every 2 or so hours you are in the sun you should have the maximum sun protection possible.
Beauty Collection carries sunblocks from the top sun care brands, including Coola, Avene, Sun Bum, CoTZ, Dermalogica, Mustela and MD Solar Sciences.