Urban Bar's double-walled mixing tin is embellished with a diamond cut motif, and its dual layers of high-quality steel trap an air pocket which insulates...
I have tried making stirred cocktails in a double-walled vessel, and find that one may have to compensate for the lower heat transfer. Where a single-walled shaker or cup will transfer heat via condensation on the outside, these double-walled vessels will not. This will cause the ice to melt less, which may be desirable, but may not, depending on the drink.