The Sof Comfort Memory Foam with Gel Orthotic Insole provides a personalized supportive fit for full-foot comfort. Memory foam instantly forms to your foot for customized cushioning and the composite plate helps provide support and stability. It is great for work shoes boots casual shoes and sneakers. To trim simply remove the existing insole from your shoe line it up with your new insole as a guide and trace with a ballpoint pen. Carefully cut with a sharp pair of scissors then insert into your shoe with the top side up.