I have the HSS and it's awesome!! I was recently out during the winter stomr here on the east coast and set a new personal record for low temps. 8 degrees. 8!!! I never felt a chill with my HSS. I used a HG 0* UQ. The standard length is plenty long enough for me to pull over my head with my legs straight for that extra comfy cocoon feeling. I'm 6' tall.