Originally Posted by
onbike 1939
The Spa saddles are firmer due to the thicker leather and the Brooks "Proofide" is merely a mixture of wax, oils and citronella which when used, gives a very temporary sealing to the the rolled top-side of the saddle. The leather used in the Spa saddles has had a waterproofing process applied and the underside has been covered by a tough waterproof material.
If you waterproof a leather saddle, you're negating one of the cardinal virtues of these things and, if this is what you require, you should consider switching to a synthetic one.