Possible Clues:

• It's comfortably smooth, but vessels capsize
• Glossy and well fed
• Ultimately criminal to hunt bears with glossy coats
• Like a smooth-sailing clipper ship
• Aerodynamic — well-groomed
• Bottoms round and smooth
• Smooth, streamlined
• Glossy and smooth
• Smooth ridges going west
• Streamlined, as a Porsche 718 Cayman