Work is well underway to evolve the SPUTNIK base garment pattern to accommodate the new sensor array At this stage, we are looking to offer and adjustment option in each size as a comfort . We will continue on with i-RULE's Turbo Merino as the base fabric and the tank top format however, expect to see COSMO in a bike shirt version as well for reasons we are not yet able to share with you Stay tuned as it will put the mega mouth brands such as Garmin,Polar and SUUNTO back in their dreary boxes.