The other day, I had a bad brush day with my Simpsons 20mm Berkeley. The hairs felt a bit stiff and though the amount of lather was copious, the Berkeley flow was mediocre at best. The previous times, the Berkeley was supple and flowed as good as any synthie. I had the same happen to me with other badgers, too. Could it be that it depends on the shaving creams and their different ingredients? Maybe some chemical compounds make the hairs go stiff. Or does it depend on the liquidity of the cream? I don't have any real explanation. What's your two cents?