Available to fit 22mm or 24mm lugs this superb silicone rubber watch strap comes in three colours, bright orange, blue  or black

Sporting a nice sturdy satin steel buckle it's additional ribbed back will help to increase air flow under the strap for comfort and hygiene

Silicone Rubber straps are of course totally impervious to water and tend to stay more supple over their lifetime than do the resin and rubber types

The strap is 4mm in thickness and buckled at it's longest is 17.5 cms in length. 
Add the size of your watch case to compare to your wrist size.