I installed these on a Jones H-Bar and had to cut down the long grips that come with the bar to half length so that I could move the shifter and brakes closer to the bar ends. With the change the Pogies fit pretty well. I rode in 0-40 F with gloves, thinner gloves when warmer, had no problems with cold hands, and my hands generally get cold easily. All around excellent product.
I've been using these for like 3 years and they're great. The foam donuts that seal the ends can be a pain - my son's pair are newer and have a sandpaper-y texture but mine are smooth so I spread a thin layer of silicone on them to prevent slipping.
These are expensive but keep your hands warm & dry. When it's hovering around freezing and wet you'll be glad you bought these.