During periods of hot or cold weather, collectors often seek to add or reduce the effective length of a bracelet for watches so equipped. When hot weather is anticipated or physical activity is anticipated, check to confirm whether your watch is equipped with a micro-adjustment feature in the clasp body.
For contemporary Rolex models, this mechanism is a mechanical snap-fit hinge that allows the user to add or subtract 5mm of bracelet length. Jaeger-LeCoultre uses a similar system on its sport watch bracelets, but a micro link can be found on either side of the deployant clasp body; releasing both micro adjustments offers considerable room for the wrist to expand. Always check for a micro-adjustment mechanism before asking a jeweler to add or remove links for activity or weather-related reasons.
If a watch offers the potential to be worn on a strap or a bracelet, weather can dictate which option is most desirable. In general, metal bracelets are considered to be more comfortable, resistant to perspiration, and durable during hot weather. Bracelets tend to conduct heat away from the wrist, and they pose no risk of damaging leather or delicate fabric when the time comes to take a dip in the pool or surf. Moreover, the bracelet will be easier to clean after a sweaty day in the sand or salt water.
However, straps are considered to be more comfortable in cold weather. The non-conductive properties of leather, textile and rubber prevent them from transferring ambient temperature to the wrist, and cold weather reduces the likelihood of damage from perspiration or aquatic activity.