For swimmers and triathletes, it is imperative to have a waterproof heart monitor. Fortunately, we have an excellent selection of heart rate monitors that are waterproof. Do read the manufacturer's specifications; typically they will say it is waterproof to a certain depth. Some are probably designed more for running or cycling outdoors in the weather. You can determine whether their description meets your needs.
Just to be on the safe side, as you are going through the checkout process and before you've given over your credit card info, I recommend giving a quick call to the merchant to confirm that they will stand behind the product if it is used for swimming, unless the description specifically says it is suitable for swimming.
