I’ve tried the Strassburg Sock, but it really doesn’t work for me because it pulls too hard on my toes and causes pain, plus the strap gets caught on the covers at night. I always end up ripping it off at some point.
https://www.amazon.com/Strassburg-Sock-White-Regular-around/dp/B00JB2UDTQ/?tag=tidbitselectro00
Instead, I have this night split from Darco that was given to me by a doctor during my 2012 bout of PF. It’s OK, but I don’t love it. The pneumatic part of it broke nearly instantly, and the velcro straps are a little too long so they don’t connect to themselves, but instead to the general covering.
https://www.amazon.com/Darco-Pneumatic-Night-Splint-Large/dp/B002BUZW0U/?tag=tidbitselectro00
If I were buying one of these now, I’d try this one, which looks a bit simpler and is cheaper:
http://www.amazon.com/dp/B00SUX39RK/?tag=tidbitselectro00
I might also try one of these super cheap versions that goes over the front of the ankle. The risk is that its adjustable aluminum bar in the front will be uncomfortable—the 1-star reviews mostly mentioned that.