I would really recommend that Lowe Alpine water proof peaked Mountain cap.
It retails for around the £30 mark, but is an incredible investment, for those inevitable wet days throughout the year.
The quality of manufacture is magnificent, and as its fleeced lined, its more suited to those cooler autumn and winter months, but i have worn it in terrible conditions during the summer, and it makes walking in heavy rain more tolerable.
It has a well thought out rear velcro adjustment, so will fit all head sizes.
Have a great Christmas, and if any relative is struggling for a potential Christmas pressy, mention the Mountain cap.
I bought my late fathers cousin who lives in Prestatyn , one of these hats, some years ago, so he can walk the dog in all weathers, he still mentions that its one of the best presents he has had for many years.
You may have other ideas regarding headwear, but ive seen Alan Hinkes, Hamish Macinnes, and even Doug Scott, wearing one of these Mountain caps.
I know their sponsored by various companies, but unless the product is decent enough, they would not consider wearing it.