The boots in the image are the UGG Adirondack Boot XXV in the "Cobble Grey" colorway. This specific version was released to celebrate the 25th anniversary of the Adirondack line, combining elements from the original Adirondack and the Butte boots. 
Key Features
Weather Performance: These boots are heavily winter-ready, featuring a waterproof leather and suede upper with a DryTech membrane. They are weather-rated to withstand temperatures as low as -32°C (-25.6°F).
Traction: They utilize a high-performance Vibram® ICETREK outsole specifically designed to provide superior grip on icy or snowy surfaces.
Comfort: The interior is lined with 17mm UGGplush™ (a blend of upcycled wool and lyocell) and includes a removable sheepskin insole for warmth.
Style Details: They feature distinctive orange laces and a cuffable shaft lined with shearling that can be worn up for extra protection or folded down for a different look. 
Sells in-store at R6000
Brand: Ugg
Size: UK 5
Condition : Brand new, never yet worn.