Cross-country race bikes that are ridden by pros are very light as they feature specs that are either too expensive or not available to the general public. That said it's not uncommon to find brands selling premium models that are even lighter than the bikes their team riders use. That’s generally due to sponsor demands (for example, RockShox SID Ultimate SL forks are heavier than Fox 32 Step-Cast, and Shimano XTR is heavier than SRAM XX1). With no contractual obligations for consumer bikes, sometimes brands just fit cost-no-object component mixes to create a super-light show stopper you can buy off the shelf.