As we ascended Y Couloir we noticed some pockety wind slabs on the skiers right side. At 8500ft we came across a large wind slab that spanned the entire couloir which caused us to stop and reassess. This slab was thicker (about four inches) and firmer than what we had seen below. The slope is steeper here and with new snow coming in we decided to bail. We booted down the wind slab and then skied from about 8000ft all the way to the base. During our transition the sun came out and on the descent we witnessed several roller balls and wet sluffs. The softened snow made for great skiing.