The PLASMA line will meet the demands of the buget oriented rider looking for quality. Offering a great fit and protection from the elements, ION wraps it all up in a spicy and unique design. All of the PLASMA models have the following standard features: Segmented Sole: Creative and strategic cuttings have been integrated into the sole to enhance the flexibility in critical areas of the foot. Rubber wings: Added support to the vulnerable ankle areas. NS = No split construction RT = Round toe no-split version.