Is the Terrex Skychaser GTX truly waterproof?

Yes. It uses a Gore-Tex membrane plus a textile lining, so it sheds rain and splashes. Feet can still get damp in sustained heat or if water enters over the collar.

How does it fit compared with other adidas hiking shoes?

It runs close to true to size but on the snug side, and it comes in medium and wide widths. Shoppers between sizes or with wide feet should consider the wide option.

Is it good for backpacking with a heavy pack?

It is better suited to day hikes and light loads. The cushioning is generous, but the mesh upper and moderate lugs give less support and traction than a stiff leather boot.

Can I use it for trail running?

Yes, many buyers do. It is light, cushioned and has a 10 mm drop, though the higher stack and hiking-oriented outsole make it less precise than a dedicated trail runner.

What is the difference from the Terrex Swift R3 GTX?

The Skychaser uses Boost foam for softer cushioning and a more breathable mesh build. The Swift R3 is firmer and more abrasion-resistant, aimed at rougher, faster hiking.

Does it work in winter?

It handles cold, wet conditions and light snow, and the waterproofing helps. For deep snow or icy trails you need warmer socks and traction aids, since it is not insulated.