Diving Suits: Picking the Right Suit

Wetsuits

For recreational diving in temperate or tropical waters, wetsuits are the most common choice. Made of neoprene, https://www.smp-ltd.com/commercial-diving-equipment/diver-gear/diving-suits trap a thin layer of water between the suit and the diver’s skin, which is then warmed by the body to provide insulation. They come in various thicknesses, typically ranging from 2mm to 7mm. A 3mm wetsuit is ideal for warm waters (75°F to 85°F), offering just enough insulation without overheating the diver. In slightly cooler waters (60°F to 75°F), a 5mm wetsuit provides more warmth while still being flexible enough for ease of movement. For even colder waters (50°F to 60°F), a 7mm wetsuit is recommended, especially in areas like the Pacific Northwest or northern European waters in summer. Wetsuits are affordable, flexible, and easy to use but are not suitable for extremely cold waters, as they allow water to enter the suit, which can cause discomfort.

Drysuits

When diving in colder environments where water temperatures drop below 50°F (10°C), such as in ice diving or polar expeditions, drysuits are the go-to option. Unlike wetsuits, drysuits are designed to keep the diver completely dry by sealing off water entry points. Divers wear insulating layers underneath the suit for warmth, making drysuits perfect for freezing environments. Neoprene drysuits offer additional insulation, while membrane drysuits (made from trilaminate or bilaminate materials) are lightweight but require thermal layers for warmth. Drysuits provide superior protection and can be adapted for various water temperatures but tend to be more expensive and less flexible than wetsuits.

Semi-dry

For divers in mid-range water temperatures between 45°F (7°C) and 65°F (18°C), semi-dry suits offer a practical solution. These suits, which have seals around the wrists, ankles, and neck, allow a small amount of water to enter but retain enough warmth to be more insulating than standard wetsuits. While they are not as effective as drysuits in extremely cold water, semi-dry suits strike a balance between warmth and mobility. They are easier to wear and more affordable than drysuits, making them suitable for dives in moderately cold environments.

Shorty Wetsuits

In warm water diving, where temperatures are above 80°F (27°C), shorty wetsuits and rash guards provide the necessary protection without excessive insulation. Shorty wetsuits cover the torso and leave arms and legs exposed, offering flexibility while providing some thermal protection. Rash guards, on the other hand, are thin garments that protect the skin from the sun and marine life. These suits are lightweight, easy to pack, and perfect for tropical diving, though they offer little to no protection in cooler waters.

Heated Drysuits

For extreme cold environments, such as ice diving or polar expeditions, heated drysuits are an advanced option. These suits come with battery-powered heating elements that provide extra warmth during long dives in freezing waters. Divers can also use heated undergarments beneath their drysuits for additional insulation. Though expensive and requiring more equipment management, heated suits allow divers to safely and comfortably explore some of the coldest underwater environments.

Freediving

Freediving suits are a unique option for those who practice freediving or snorkeling in various water temperatures. These two-piece suits are often made of smooth, unlined neoprene, designed to minimize drag and maximize flexibility. For warm water, freedivers typically opt for thinner suits (1-3mm), while thicker suits (5-7mm) are used in cooler conditions. Although these suits offer excellent flexibility and comfort, they may not provide the same level of warmth as thicker wetsuits or drysuits.

When it comes to sourcing high-quality diving equipment, Submarine Manufacturing & Products Ltd (SMP) is a leading supplier with decades of industry expertise. Founded in 1985, SMP has established itself as a global provider of specialist subsea equipment, catering to both commercial and recreational diving needs. The company is renowned for its deep technical knowledge and expert craftsmanship, offering solutions for some of the most challenging underwater environments. Operating worldwide, SMP has built a strong reputation for reliability, serving a diverse range of clients across the globe, from diving schools to large offshore operations. Their extensive product range, including cutting-edge diving suits and life support systems, reflects their commitment to innovation and safety in the subsea industry.

In summary, the choice of diving suit largely depends on water temperature and the type of dive. Wetsuits are great for temperate and tropical waters, while drysuits are essential for cold-water diving. Semi-dry suits and shorties provide solutions for mid-range temperatures and warm water dives. For extreme cold, heated drysuits are necessary, and for freedivers, specialized suits ensure maximum flexibility and hydrodynamics. Selecting the appropriate suit enhances both safety and comfort, making each dive more enjoyable.