Es FOOTWEAR STI ENERGY FOAM INSOLESTI Energy Foam is a Sole Technology Institute engineered formula of high rebound foam that gives you the spring off the board and shock protection you need to skate at the highest level. NOT RESPONSIBLE IF YOU CUT IT WRONG! TRIM CAREFULLY! Small Size 7 8 Medium Size 8. 5 9. 5 Large Size 10 11 Extra Large Size 11. 5 13 Enhance Rebound Foam 200% Energy Return (Fixed Load) 40% Lighter Than Regular EVA