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The NEW Memory Belt (2007) is the recommendation. It's the one that comes with it's own docking station and stores the data on the belt itself.

There are three different types of HR belts that can be used with different HR monitors.

The analog HR belt, which works with analog transmission technique, will show your HR also while in the water. The conductivity of the signal is not as good in the water as on dry land, but you are still able to get HR readings on your watch. This type of belt is used with the following HR monitors: Advizor, Metron, X3HR, X6HR, X6HRM, X6HRT and t1.

The ANT HR belt uses radiofrequencies to transmit the HR signal to the HR monitor. Even though both the Suunto HR monitors using this transmission technique and the ANT transmitter belt are water-resistant, the radio signal does not carry in water, which makes the communication between HR monitor and the ANT transmitter belt impossible. This type of HR belt is used with the following HR monitors: Suunto t3, t4 and t6.

The third type of HR belt is the Memorybelt (and also the discontinued SmartBelt). This HR belt also uses the ANT transmission technique but contains an internal memory chip and is able to record the HR in the belt itself without any HR monitor on you wrist. That's why the Memorybelt can be used also in water to record the HR, and the recorded HR data can then later on be transfered to the Training Manager PC software. In addition to being able to record the HR, the Memorybelt can also be used as a HR transmitter while not in water. The Memorybelt can be paired with all ANT compatible HR monitors (Suunto t3,t4,t6) and used instead of the regular ANT HR belt.

	Suunto Visit SuuntoWatches.com to see Suunto's full line of wrist top computers and compasses.

	Suunto t1 - Click for more info Suunto is running with the success of their t6 personal training wristop computer, making three new models (the t1, t3, and t4) available for a range of prices and features. Every one of the t-series Suunto personal training watches monitors your heart rate, real-time calories burned, and helps you establish and maintain a personalized fitness profile. The purpose of the t-series is to assist in the development of an optimal training range for fitness enthusiasts, a task that was at one time reserved for professional athletes or others with access to personal trainers and elaborate monitoring equipment.

	Sunnto t3 - Click for more info At one point a fitness enthusiast who wanted to monitor and track their heart rate, caloric burn, and other exercise data would need a tangle of electrodes, complex equipment, and extensive personal guidance from a certified fitness trainer. Today, all you need is a Suunto t-Series wristop training device, a PC, and one or more accessories to create an optimal training range that outlines your ideal energy expenditure and muscle exertion while preventing you from overworking and damaging your muscles.

	Suunto t4 - Click for more info he Suunto t4 is another excellent addition to Suunto's growing line of fitness training wristop computers. Like all of Suunto's t-Series training watches (the t1, t3, t4, and the original t6) the t4 monitors your heart rate and caloric burn to assist you in developing an optimized fitness regimen. It also provides you with information about the progression and effects of your training through constant feedback on how to maximize the intensity our your exercises without the over exertion of your heart and muscles. This "intelligent sports watch", via a simple cell-phone like interface, offers clear advice on how to get the most out of each and every workout.

	Suunto t6 - Click for more info The Suunto t6 is one of the most exciting new personal training devices to hit the health and fitness market this year. The "t" in t6 (if you don't want to get too technical) stands for "training". It actually refers to the time interval between two heartbeats, or EPOC. Measured to the millisecond, this interval allows you (using the included PC software) to assess your current fitness, set a proper training load, measure your actual fitness gain over time, and achieve your overall fitness goals.

	Suunto X6 HR - Click for more info Just when you thought a sports watch couldn't get any better, Suunto introduces the X6 HR, X6 HRM and X6-HRT. These are truly the next generation in sports watches, packed with all of the technology that Suunto enthusiasts have been craving. Designed for Cross Sports applications, the X6 writstops are functionally very similar to the Suunto X6 - but with the added benefits of a heart rate monitor.

	Suunto X3HR - Click for more info The Suunto X3HR is 'the' training watch for the active outdoorsperson. It integrates an altimeter function with a heart rate monitor - to keep a pulse on you and your environment. This unique combo lets you get the most out of your outdoor workouts. The altimeter monitors terrain variations during running, triathlon training, hiking, and mountain or road biking. Weather functions allow you to predict weather changes and plan accordingly. The heart rate monitor gives comprehensive feedback on your performance. The smaller overall size is ideal for men and women who don't like oversized watches and/or have smaller wrists.

	Suunto Advizor - Click for more info The Suunto Advizor - featuring a Heart Rate Monitor using Suunto's proprietary HR technology - simultaneously shows your heart rate, altitude, and vertical ascent/descent data. The Advizor memory stores your total training time and your maximum, minimum and average heart rate during training - plus your time spent in / above / below your pre-set target heart rate. There's even an audible alarm to alert the user when your upper or lower heart rate limits have been exceeded.

	Suunto Training Effect watches - Click for more info More than a heart rate monitor, Suunto's exclusive Training Effect feature tells you whether you're training too little, too hard or staying within the zones for optimal improvement.