The Ride Pro Aquazero arm warmers are made in Italy but designed with the UK climate in mind. Super Roubaix panels are sewn into an anatomical shape with a bend in the elbow so they don't bunch up when you're on the bike. They have silicone silicone grippers top and bottom to keep them in place.
The Sportful No-Rain arm warmers perform a lot like regular arm warmers except that, as the name implies, they are also water repellent.
At £54.99, you'd be forgiven for dismissing the Ride Aquazeros as just another set of standard bibtights but you couldn't be more wrong. These UK designed and Italian made tights are serious performers, and left me scratching my head as to why I'd want to spend any more on other options.