Problems with Heart Rate Monitor

I use the Wahoo LE Bluetooth one and like you have a large chest - no problems slipping. Although sometimes it feels like it is, it isn't. Whatever the strap is made from, it's very grippy.

dare suggest you tie on shoulder straps to your chest strap? Yeah - like a bra, but it works for countless women so why not you?

How about you get a couple of narrow strips of rubber and bond them onto the back of your strap. There is a great tacky adhesive that we get over here that you spray both items you want to glue together, wait a few minutes until truly tacky, and then put together and place a weight over the top and leave for an hour or so. Can't remember the name of it, but for sure you will be able to get that over there. The benefits of narrow strips of rubber, rather than one thicker strip, is that they will not constrict the movement of your strap too much, but will still "grip" onto you back. Another option is to find a sewer that can stitch thick elastic thread along the back of your strap. Because it is elastic, it will still move with the strap, but the elastic will grip onto your back - make sure it is thicker elastic, so that you get maximum grip, and run at least 3 rows along the strap.

Either one of these options should work for you. I didn't realise that your problem is twofold - it is not only that the strap is slipping, but also that you have one of those physiques that includes a broad chest tapering to a narrow waist. That is an entirely different problem.

Another thing to consider is wearing a super-tight singlet as your inner layer. This will help to keep the strap in place.

Oh, and ANOTHER option, is to buy yourself another strap. Not a HRM, but an elasticated webbed belt or strap that you can place slightly below and slightly overlapping your HRM strap. This will help to hold it. You could even combine these last two options, place the singlet over your HRM, then place this webbed belt on top of the singlet, but again placed overlapping your HRM strap.

Wow - I am fully of ideas, now! Last resort is to turn it into a man bra - no-one will ever know . . . except for us!!! xx

It's a Polar strap, probably about seven years old or so. The front is rubberized while the back is a very smooth eslastic.

Yep, those slip. A shoelace will solve the problem but it rubs funny.
The new ones are better.