Giant's accessory range is increasing all the time and now includes these tidy semi-carbon clip-ons. The carbon extensions certainly make them look pricier than they are, as well as making weight very competitive. They hang below the bar line, with the S-bend bringing them up to a neutral hand height, with internal cable slots and trim lines at the rider end for symmetrical cutting.
The neat hinged clamp is designed so the single bolt tightens both extensions and separately angle-adjustable armrest arms together. The low profile Velcro-anchored pads sit on three-position pad plates, with three holes on each arm too. It's all a bit of a balancing act getting it together, but adjustability works really well once together. There’s a U-bend version too, but that’s £30 more expensive and heavier.