The Brooks Caldera 8 are the ideal companions for ultra trail running and long-distance races. Designed to offer ultra-comfortable cushioning and an adaptive stride, these shoes are ready for all your trail adventures. Surface: Trail. Shoe type: Neutral. Use: Ultra trail running, long training sessions. Weight: 303 g. Drop: 6 mm. Midsole height: Maximum thickness for lasting comfort. Cushioning: DNA Loft v3.