Waterproof binoculars are dry nitrogen charged and sealed against moisture and fog. In recent years, our roof prism 8x42 and 10x42 waterproof with broadband multi-coating on objectives have dominated the optical market for hunting, birding and boating in Europe. Porro prism 10x50 waterproof wide angle with broadband multi-coating on objectives are popular as a multipurpose binoculars in U.S.. 

Starting 2004, 8x42 and 10x42 WPII are available.  They are different from WPI in:

• Triplet objective (compared with the doublets objective of WPI )
• Internal focus (compared with the external focus of WPI version)
• Shockproof (drop it from 5 meters high, the prism is still dead-on)
• All metal-design, so they are heavier than WPI verson.

All the waterproof binoculars come with Bak-4 prism, broadband multi-coating on the objectives, rugged rubberized metal bodies, all-glass lenses, right ocular diopter adjustment, brass 1/4-20 tripod adapter threading, case, caps, and strap.