Ski tunnels or indoor ski arenas make it possible to do cross-country skiing year-round. The temperature inside the tunnel is kept at a constant temperature of a few degrees below zero Celsius to prevent snow from melting.

[edit] Available ski tunnels

• Ylläs-Halli in Helsinki, Finland
• DNA Ski Tunnel in Sotkamo, Finland
• Paippi in Paimio, Finland
• Jämi Ski tunnel at Jämi acvitivity-centre, Jämijärvi, Finland
• Fortum Ski Tunnel in Torsby, Sweden
• Skisporthalle Oberhof in Oberhof, Germany

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