UCI CYCLING REGULATIONS  -  using only a helmet that has not been altered or had any element added or  removed in terms of design or form;  -  using only accessories approved by the helmet manufacturer.  (text modified on 05.05.03; 01.01.04; 01.08.04; 01.01.05; 01.02.07; 01.07.11; 01.01.15;  01.01.17; 27.03.17)  1.3.032 [article abrogated].  1.3.033 Items of clothing may not modify the morphology of the rider and any non-essential  element or device, of which the purpose is not exclusively that of clothing or protection,  is forbidden. This shall also apply regarding any material or substance applied onto the  skin or clothing and which is not itself an item of clothing.  Modifications to the surface roughness of clothing are authorised but may only be the  result of threading, weaving or assembling of the fabric. Surface roughness modifications  shall be limited to a profile difference of 1mm at most.  The measure of surface roughness modification shall be made without pressure or  traction on the clothing.  All clothing must maintain the original texture of the textile and may not be adapted in a  manner to integrate form constraints. Therefore, when not worn, clothing may in no case  contain any self-supporting element or rigid parts.  (text modified on 01.01.02; 01.01.04; 01.04.07; 01.10.10; 01.02.12; 04.03.19)  1.3.033 Socks and overshoes used in competition may not rise above the height defined  bis  by half the distance between the middle of the lateral malleolus and the middle of the  fibula head. (article introduced on 15.10.18) E0221  GENERAL ORGANISATION OF CYCLING AS A SPORT  73 