I cannot compliment this product enough.  I have a wide wrist and the stock strap that came with the Sunto Core was always putting pressure on the top of my wrist.  This new strap allows the watch to rest comfortable on my wrist.  The only reason this product does not get 5 stars is that it was very expensive.  I cannot see a reason why this strap should cost 50$.  It is a toss up between price and comfort.  The watch should have come with this strap as a stock strap in my opinion.  Over all, it was worth it.