Socks: Abu Hanifa’s well-known position requires leather-covered or leather-soled socks; the two disciples accept sufficiently thick opaque socks, with a report of Abu Hanifa’s later adoption.
Outer boots: Hanafis allow wiping a qualifying jurmūq, while Shafi‘i analysis may restrict it.
Removal or expiry: the Hanafi account requires washing feet if the rest of wudu remains valid, while another juristic treatment can require repeating wudu.