Hi Susan, we don't make the Zero Gravity Recliner so can't answer with the level of detail you require. However, we would not recommend a leather upholstered chair be situated where it is likely to suffer damage from direct sunlight. In this instance, the fabric upholstered option may be more suitable.
For information on John Lewis products you can phone 03456 100 336 or contact them via the web form here..
Sorry I was not able to provide the information you requested.