Selecting the right drysuit is crucial for cold water diving. There are two main materials: trilaminate and neoprene. Trilaminate suits are bulkier and require insulating undergarments, while neoprene suits fit closer to the body, providing better insulation. It’s important to choose the right undergarments for comfort and warmth, with options like merino wool and brands such as Fourth Element being popular. Lastly, a proper fit is essential for buoyancy and safety, and many manufacturers offer tailoring services for a better fit.