I bought the +20mm seat foam, expecting to make the cockpit a little more comfortable. I was stoked to find that the taller foam made a big difference for me as far as seated comfort on the bike, but the difference in the ease of transitioning from seated to standing position was not expected. What a difference! The foam is very light, firm and super comfortable. It was a great purchase and will be the first mod I make for any new bike I buy.