Pre-Order Now:br Can you remember the last time you had a proper workout without any disturbances from the blaring gym radio, falling earbuds or clatter of machines? The new Sennheiseradidas CX 680 sports earphones will change that on the first listen. These sweat-proof, noise-isolating ear-canal 'phones deliver outstanding, high-energy stereo sound while blocking out up to 20dB of gym noise.