Sayyiduna Ibn Abbas (may Allah be pleased with them both) says: I was with Sayyiduna Umar (may Allah be pleased with him) when Sayyiduna Sa'd (may Allah be pleased with him) and Ibn Umar (may Allah be pleased with them both) brought their dispute about wiping over the leather socks to him. He decided in favour of Sayyiduna Sa'd (may Allah be pleased with him), so I said: If only you had held this for a long journey and severe cold. This is his permission for wiping on a long journey and in severe cold, after he used to reject it absolutely. It is also reported from him that he gave a fatwa permitting it for the resident and the traveller alike.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1291