The Kit We Use

Basic Kit Required
The mask should have a frame, a lens, a seal and a split strap. The lens should be made of tempered glass, which prevents shattering underwater. The seals and strap can be either soft rubber or more usually now, silicone rubber. The frame is usually made of plastic. The average price should be about 25 - 30.
There are two main types of snorkel. The common 'J' Tube and the 'L' Tube. They are usually made of plastic or rubber and have silicone rubber mouthpieces. You should not get any snorkel with a valve or ball at the top, as they are dangerous. There are snorkels that come with valves at the base to aid clearing. These are good, but are harder to care for and really aimed more at divers.
There are two main types of fin, shoe fin and open heel fin. The shoe or pool fin is ideal for the beginner, being smaller and offering less surface resistance in the water and is consequently less tiring. The shoe fin, as one might expect, is supplied in shoe sizes, the foot fitting into a slipper-like pocket. Fins for growing children may be purchased slightly larger in size and socks or booties worn for comfort. The average price should be about 20 - 30.Back to the Basic Kit Advanced Kit Used
A weight belt is not needed until the snorkeller reaches the Open Water section of their training. The weight belt itself is made of woven nylon generally with a stainless steel buckle. The weights are moulded lead blocks that are covered in a protective layer of plastic, this makes them easily visible and identifiable. The amount of weight required is subject to the size and buoyancy of the snorkeller. The cost of the weight belt and weights would be about 15 for the belt and about 5 per 2kg block.
A very useful piece of open water equipment. They come in various thicknesses from about 3mm to 8mm. For snorkelling a 5mm titanium lined suit is ideal providing warmth and mobility. These can be purchased for about 90 and up.
A vital piece open water safety equipment. If you get into difficulty a lifejacket should provide you with enough buoyancy to keep your head well above water until help arrives (usually in the form of an instructor). In general the jacket fits over the head and the straps are secured behind the back.
Very useful on night dives and handy on day dives. At night it helps you see. In the day it puts light where you want to see, such as in dark crevices. The torch does not have to be expensive, suitable small torches are available for about 20. These will do for the typical snorkellers uses. Ask at your local store for advice on what to buy.
These are not a cheap addition to your kit bag, but do open up much more of the coastline to you. The typical vessel used for snorkelling, is a 5 or 6 metre Ridged Inflatable Boat (R.I.B.). These are very easily manouvered at low speeds and in suitable shallow dive sites. They can carry up to 8 snorkellers with full kit and instructors and can be a great investment for your group.