These type of muff are nice. the thing you should consider when selecting hearing protection for shooting is the noise reduction ratio (NRR). For shooting a minimum NRR of 30 is necessary to protect your hearing.
1 NRR reduces noise by 1 decibel on the A scale. The A scale on the noise meter equates to human hearing.
When you recommend hearing protection it would be good to also report the NRR. Ear muffs which meet ANSI (AS/NZS 1269.3:2005 ) standards have the approval imprinted on the Muff. If an approval standard is not imprinted or addressed in the literature which accompanies the Muffs I would not purchase them.