A pultruded fibre-reinforced strip (50) configured to be stacked with one or more similar strips (50) to form a spar cap of a wind turbine blade (10), comprising - a core (51) comprising a plurality of first fibres embedded in a resin matrix, the plurality of first fibres being carbon fibres and/or glass fibres, and - a surface layer (52) enclosing and covering the core (51) and comprising a plurality of second fibres imbedded in the resin matrix, the majority of the plurality of second fibres having an elastic modulus less than 10 GPa.
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